Stock 5sp MTX value - need?

[Mustang196t8]

I have a stock 5sp MTX I got out of a '91 or '92 with about 150k on it - i was going to replace the one in my '88 LX with it when 3rd gear started grinding. I eventually learned to shift into 3rd slower so it wouldn't grind and I changed the fluid to Redline MTL (IIRC? which ever blend helped line up the synchros faster) so I just lived with it and didn't swap it over before I got rid of my '88. Also my lofty plans was to swap to EFI and since I was going to change the fuel lines with it I was waiting to swap it when I did the EFI swap too

So I was wondering what is a stock MTX with 150k miles worth? And does anyone need one? Being I'm in CA and it weighs around 60 lbs i don't know if it's worth someone paying the shipping on it few states away.

[litesong]

5speed tranny purchase

I have a stock 5sp MTX I got out of a '91 or '92 with about 150k on it - i was going to replace the one in my '88 LX with it when 3rd gear started grinding. I eventually learned to shift into 3rd slower so it wouldn't grind and I changed the fluid to Redline MTL (IIRC? which ever blend helped line up the synchros faster) so I just lived with it and didn't swap it over before I got rid of my '88.

And does anyone need one?

Yes, I have a 4sp. '88 Festiva & I was thinking of swapping to a 5 sp. I drove a 5sp. Festiva & loved the longer legs. However, I'm not sure the 5sp. in a '91 or '92 Festiva would give the same top gear rpms if swapped into an '88 Festiva. There's been some discussion whether the swap would really give a meaningful drop in highway rpms.

Reports range that the final drive ratio may cause the final rpms to be 2%, 5%, 8%, 10% or......? It seems to be that the gear ratios outside the transmissions themselves determine the final rpms. Are the gear ratios outside the transmissions for the '91 & '92 Festivas, the same as for the '88 Festiva?

I wouldn't want to get the swap for only 2%. But a swap for 10+% would be worthy. Hopefully, my low powered '88 carbed Festiva(not the more powerful fuel-injected later Festivas) would not be over-geared. I'm already delivering 50+mpg with my 4 speed manual.

[GenevaDirt]

A 5 speed on a 91 motor is going to be the same as if it were on an 88.... 5th gear is an over drive and would lower the rpms in the same manner no matter the year of the motor.

[Mustang196t8]

Yes, I have a 4sp. '88 Festiva & I was thinking of swapping to a 5 sp. I drove a 5sp. Festiva & loved the longer legs. However, I'm not sure the 5sp. in a '91 or '92 Festiva would give the same top gear rpms if swapped into an '88 Festiva. There's been some discussion whether the swap would really give a meaningful drop in highway rpms.

Reports range that the final drive ratio may cause the final rpms to be 2%, 5%, 8%, 10% or......? It seems to be that the gear ratios outside the transmissions themselves determine the final rpms. Are the gear ratios outside the transmissions for the '91 & '92 Festivas, the same as for the '88 Festiva?

I wouldn't want to get the swap for only 2%. But a swap for 10+% would be worthy. Hopefully, my low powered '88 carbed Festiva(not the more powerful fuel-injected later Festivas) would not be over-geared. I'm already delivering 50+mpg with my 4 speed manual.

I always thought the 4 speed had the same ratios, just that it didn't have a 5th gear. I found some specs that say that - but the chart posted in the drivetrain section shows otherwise. http://www.fordfestiva.com/forums/sh...ad.php?t=11540

Either way - 4th gear in a 4sp and 4th and 5th are all overdrive gears (higher that 1:1 ratio). Some refer to only 5th as overdrive - as this is true on a lot of transmissions typically the high gear is the overdrive.

The effective gear ratio would be the gear ratio multiplied by the final drive.

So 4sp 4th gear effective ratio (3.85 x .918 = 3.53)
5sp 4th gear effective ratio (3.77 x .861 = 3.24)
5sp 5th gear effective ratio (3.77 x .692 = 2.60)

And the % change from a 4sp 4th gear to 5sp 5th gear would be 22% - now that is RPM change - which doesn't mean you will get 22% better MPG but reducing the RPM at speed by that much definitely helps - and it's better for engine longevity

At 65 mph this is the RPM you would be turning assuming a 15512 tire (aka 155/80/12) which has a diameter of 21.76"

mph x effective gear ratio x 336
------------------------------------
tire diameter

4sp in 4th gear 3547 rpm
5sp in 4th gear 3258 rpm
5sp in 5th gear 2618 rpm

This is theoretical being the tires can be a different diameter and other factors as well.

There also seems to be some speculation that there are different 4sp ratios - either way the 5th gear is a "taller" gear and will reduce rpm (see thread 4 speed blues)

http://www.fordfestiva.com/forums/showthread.php?t=37654&page=3

Now I'm wondering if there is any interest a 5sp MTX? And what would we say they are worth these days?

[litesong]

Stock 5sp MTX value - need?

I always thought the 4 speed had the same ratios, just that it didn't have a 5th gear. I found some specs that say that - but the chart posted in the drivetrain section shows otherwise. http://www.fordfestiva.com/forums/sh...ad.php?t=11540

4sp in 4th gear 3547 rpm
5sp in 4th gear 3258 rpm
5sp in 5th gear 2618 rpm

There also seems to be some speculation that there are different 4sp ratios - either way the 5th gear is a "taller" gear and will reduce rpm (see thread 4 speed blues)

http://www.fordfestiva.com/forums/showthread.php?t=37654&page=3

Now I'm wondering if there is any interest a 5sp MTX? And what would we say they are worth these days?

Yes, I came across some of the same threads & posts with varying data, as you did. Thank you for the extra data & your take on the situation. Since my car doesn't have a tachometer, I really like the rpm information. The 22% decrease in rpms is dramatic, but reinforces my idea that my lesser powered carbureted '88 Festiva, may NOT have the power to efficiently run my Festiva at highway speed & get good mpg. I do understand your commentary that any mpg I get, most certainly might NOT correspond to the 22% rpm reduction the 5speed tranny would give to my Festiva. I changed my chain, sprocket & counter-sprocket set on my motorcycle, reducing my motorcycle rpms by 15% & got smoother highway running. My mpg on the cycle didn't go up by 15%, altho I did get 10% more mpg.

My 4speed Festiva has 95,000 miles on it that I have owned for 21+ years when it only had 50 miles on it. So, I know its history. I love my 4speed, except for its short legs. Got to drive a 5 speed Festiva the other day & immediately loved it. The Festiva 5 speed really made for a nice highway drive, while my 4 speed is quite frenetic.

[Jim Rockford]

Just drove mine on the interstate last night for the first time, did about 24 miles and man I damn sure had to keep an eye on it because it would keep wanting to go faster,, 70-75 was no effort at all. and best of all i don't think the gas gauge hardly moved..lol I'm not use to that after driving a 3/4 ton truck that gets 16mpg.

[91mcnasty]

^ the longer you have these little things, the more they grow on you!

[bhazard]

Id give $50-100 for a good working 5sp

[Bert]

Value of a transmission is largely conditional on demand for one. At the moment mine are all functional and a spare is of some interest providing it's cheap ($50-100) but were I to blow one up and need another right away then all of a sudden $3-400 doesn't look so bad. The unfortunate thing about distances is that shipping is a killer on items like this.

[freshtiva]

Value of a transmission is largely conditional on demand for one. At the moment mine are all functional and a spare is of some interest providing it's cheap ($50-100) but were I to blow one up and need another right away then all of a sudden $3-400 doesn't look so bad. The unfortunate thing about distances is that shipping is a killer on items like this.

True that ! You can mail them though, I had an actual weight once.

[Safety Guy]

Mustang, your chart says there is one final drive ratio for all years of Aspire, but I had thought there were some final drive changes within those years. Maybe that was just for the auto Aspires.

Need more info...and confirmation of all info.

As for putting a 5 speed in a 4 speed, I'd just do it. Carbed Festivas were made with 5 speeds in '88 and '89. Remember, it's not just hp, but also torque figures at whatever rpm. Should not be a problem!

Karl

[cway1319]

can you swap a auto 3 gear for this? obviously there would be some fab.

[ew4329]

5 speed transmission part number

The first and second gear synchronizers in my 5 speed transmission have gone out. I found a guy that has four Festiva transmission in a crate, however he doesn't know if they are 4 or 5 speeds. Can someone tell me how to tell the difference? Where is the part number located on the transmission? What would be the part number of the 5 speed transmission?

Thanks