My 5th gear swap into my g series trans:lots of big pics

[fastivaB6TG25MR]

i sourced my new 5th gear out of a 2.2l ford probe with a g series transmission.
i decided to swap 5th gear cause i had to replace the 5th gear cover due to an interference issue(some one installed the wrong end cap from another g series on it and i didnt notice til it was installed)

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210183549.jpg

the difference in 5th gear covers:

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210184147.jpg

the gears side by side with the .71 gear on the left:

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210175245.jpg

the numbers on the new .71 small gear are HC31D

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/HC31D.jpg

the numbers on the stock gear are LC7N

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/LC7N.jpg

first i put the car into 1st gear. then i dropped my trans crossmember low enough to remove the 5th gear cover. once the cover was removed i hammered out the roll pin for the 5th gear selectoricture is taken fom me laying on my back looking up at the trans

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210184811.jpg

with the roll pin removed i slid the arm to engage 5th gear:

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210184925.jpg

having the transmission engaged in both 1st and 5th locks up the tranny and keeps the gears from spinning...

i dont have access to air tools so i used my giant 1/2" 4' long breaker bar, a 12" extension and a 32mm and a 26mm socket. i used a jack stand for a pivot point to keep the socket square with the nuts

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210185308.jpg

after removing the nuts you just pull off both reverse gears and thereverse/5th gear hub and synchro . make sure the reverse/5th gear hub and synchro stay together because there are 3 little tabs held in by 2 snap rings and they will go flying. then pull off the 5th gear gears, replace with the new gears and install in reverse order. make sure to throughly clean the 5th gear cover and trans mating surface before applying rtv/silicone. with the stock end cap back on i have clearance again!!!!

http://i271.photobucket.com/albums/jj146/aintnobitch/Fastiva/5th%20gear%20swap/1210205432.jpg

it dropped my 5th gear rpm by about 250rpm which may not sound like much but it does lower the noise in the car quite a bit...

[Damkid]

Looks relatively easy to get to with the tranny still in the car, which is good

[Aaronbrook37]

Yeah wow I'm impressed you did it with the transmission in! Nice work, brother... that'll make a huge difference in the car's performance!

[fastivaB6TG25MR]

Looks relatively easy to get to with the tranny still in the car, which is good

depends on how you mounted your engine/trans. i loosened the nuts on my front motor mount until they were flush with the studs. then i took the 4 bolts out of the cross member and lowered it until the crank/alt pulley wer touching the frame rail on the passenger side... the cover was a tight fit. especially when trying to install it with silicone sealant on it.

as for performance it added around 16mph to my top speed according to: http://www.catherineandken.co.uk/sti/tyres.html

[Damkid]

i kinda figured it took the crossmember being un-bolted in order to lower the trans low enough to get the cover off, but thats sure a hell of a lot less work then pulling the trans all the way out of the car

[Rocketman]

Hmmm only a 250 RPM drop? What size tires are you running? Should be closer to 500 rpm drop. Whats your FD ratio?

Do you have the correct gearset, did you count the teeth? The .716 gears I have here have part number A9CN on them

[fastivaB6TG25MR]

i havent reset my speedo yet so tire size doesnt matter. 60 was at 2800 now its just above 2500 i have the 4.11 diff i believe... im sure i have the right set it came out to .71739 33 teeth on the small gear and 46 on the big one. stock is 35/43

actual speed is 10% slower than speedo speed due to the 215/50/13's im running

according to : http://www.catherineandken.co.uk/sti/tyres.html my rpm dropped around 350ish

[Rocketman]

Interesting that the part numbers are different. He'res some numbers I ran

Stock Capri Gtype

    GearCalc v2.0.0.3  Copyright ©2001, Peter Ogden
    Gear Ratio, Speed and RPM Calculator

    Gear set: Manually entered values
    Gear        1        2        3        4        5      Final
    Ratios:   3.307    1.833    1.233    0.970    0.795    3.850

    RPM Limit:          6800
    RPM @Peak Power:    5500
    Tyre Size:          185/60 x 14
    Tyre Diameter:      22.74 in
    Tyre Circumference: 71.44 in


    Gear   Mph per 1000 RPM   Mph @5500 RPM   Mph @6800 RPM
    --------------------------------------------------------
      1         5.31                29              36
      2         9.59                53              65
      3        14.25                78              97
      4        18.12               100             123
      5        22.10               122             150
    
     Mph             RPM (in Gears)
    -------------------------------------------------
               1        2        3        4        5        
    -------------------------------------------------
       5      941      522      351      276      226
      10     1882     1043      702      552      452
      15     2823     1565     1053      828      679
      20     3764     2086     1403     1104      905
      25     4705     2608     1754     1380     1131
      30     5646     3129     2105     1656     1357
      35     6587     3651     2456     1932     1584
      40              4173     2807     2208     1810
      45              4694     3158     2484     2036
      50              5216     3508     2760     2262
      55              5737     3859     3036     2488
      60              6259     4210     3312     2715
      65              6780     4561     3588     2941
      70                       4912     3864     3167
      75                       5263     4140     3393
      80                       5614     4416     3619
      85                       5964     4692     3846
      90                       6315     4968     4072
      95                       6666     5244     4298
     100                                5520     4524
     105                                5796     4751
     110                                6072     4977
     115                                6348     5203
     120                                6624     5429
     125                                         5655
     130                                         5882
     135                                         6108
     140                                         6334
     145                                         6560
     150                                         6786
    
    Gear Change  RPM drop (change @5500)  RPM drop (change @6800)
    -------------------------------------------------------------
      1 -> 2         -2451 (to 3049)          -3031 (to 3769)
      2 -> 3         -1800 (to 3700)          -2226 (to 4574)
      3 -> 4         -1173 (to 4327)          -1450 (to 5350)
      4 -> 5         -992 (to 4508)          -1227 (to 5573)

Capri Gtype w/ .71 5th Gear

 GearCalc v2.0.0.3  Copyright ©2001, Peter Ogden
    Gear Ratio, Speed and RPM Calculator

    Gear set: Manually entered values
    Gear        1        2        3        4        5      Final
    Ratios:   3.307    1.833    1.233    0.970    0.717    3.850

    RPM Limit:          6800
    RPM @Peak Power:    5500
    Tyre Size:          185/60 x 14
    Tyre Diameter:      22.74 in
    Tyre Circumference: 71.44 in


    Gear   Mph per 1000 RPM   Mph @5500 RPM   Mph @6800 RPM
    --------------------------------------------------------
      1         5.31                29              36
      2         9.59                53              65
      3        14.25                78              97
      4        18.12               100             123
      5        24.51               135             167
    
     Mph             RPM (in Gears)
    -------------------------------------------------
               1        2        3        4        5        
    -------------------------------------------------
       5      941      522      351      276      204
      10     1882     1043      702      552      408
      15     2823     1565     1053      828      612
      20     3764     2086     1403     1104      816
      25     4705     2608     1754     1380     1020
      30     5646     3129     2105     1656     1224
      35     6587     3651     2456     1932     1428
      40              4173     2807     2208     1632
      45              4694     3158     2484     1836
      50              5216     3508     2760     2040
      55              5737     3859     3036     2244
      60              6259     4210     3312     2448
      65              6780     4561     3588     2652
      70                       4912     3864     2856
      75                       5263     4140     3060
      80                       5614     4416     3264
      85                       5964     4692     3468
      90                       6315     4968     3672
      95                       6666     5244     3876
     100                                5520     4080
     105                                5796     4284
     110                                6072     4488
     115                                6348     4692
     120                                6624     4896
     125                                         5101
     130                                         5305
     135                                         5509
     140                                         5713
     145                                         5917
     150                                         6121
     155                                         6325
     160                                         6529
     165                                         6733
    
    Gear Change  RPM drop (change @5500)  RPM drop (change @6800)
    -------------------------------------------------------------
      1 -> 2         -2451 (to 3049)          -3031 (to 3769)
      2 -> 3         -1800 (to 3700)          -2226 (to 4574)
      3 -> 4         -1173 (to 4327)          -1450 (to 5350)
      4 -> 5         -1435 (to 4065)          -1774 (to 5026)

[bhazard]

I thought the different was 4.11 in our trannies?

[Rocketman]

FSM says the Capri Gtype has a 3.85 final drive... the N/A capri trans is 4.105

[fastivaB6TG25MR]

ill ask the shop that rebuilds my trannies tomorrow... i saw a post on club protege that said that was a mis print... id love a 3.85 diff though....

[MEXTIVA]

Nice, I wish i had the fifth gear swap..It helps when driving the car as a dd.

[fastivaB6TG25MR]

ill ask the shop that rebuilds my trannies tomorrow... i saw a post on club protege that said that was a mis print... id love a 3.85 diff though....

apparently i do i have a 3.85 diff... the tooth count is 77/20 i was wondering why the gear/speed calculator seemed off... the trans shop also said next time i blow it up they'll count the teeth while they have it apart...

[Damkid]

I believe it's the EGT trans has the 4.11 gears, I'm not positive but I can tear my trans apart to find out lol and when I did my diff swap in my probe trans I counted the teeth in my 323 gt/capri trans and it was the 3.85 final drive, but the probe trans is 4.38

[fastivaB6TG25MR]

Nice, I wish i had the fifth gear swap..It helps when driving the car as a dd.

i can get you a set from pnp if you'd like...