Since we can't get different speedo gears, what trans swap will allow bigger wheels?

[Larry Hampton]

I've done a search, but it's giving me a headache.

Rio trans, EGT trans,.... what 5-speed would get me into a taller tire and still read correctly?

[FestYboy]

the speedo can be recalibrated.... just need to know the revs per mile and the ring gear ratio.

[georgeb]

You would swap trannies just to have an accurate speedo?

[link5186]

I've been wondering about this, too. I'm ocd about having an accurate speedo. I was kinda hoping I'd be able to go with a taller tire when I get around to the f swap. Anybody got numbers handy for the ring gear? I can count teeth on an e later this evening.

Sent from the bathroom via crapatalk.

[eurotiva]

I have a g series. With the capri speedo drive. I run 195/50r 15 and my speedo is within 1 mph @ 75mph

[Damkid]

My speedo is dead on

[DON SVO]

The speedometer will read whatever the cable says to read. The solution would be an electronic sender and gauge. If you're running a tire way outside of specification, there aren't many ways to molest the reading without it.

[Larry Hampton]

So no one knows the answer?

I have to type out a big long explanation of what I want to possibly do?

EGT's came with 14's. Rio's have, what, 15's? I know people have put them in Festivas.

12" tires suck for longevity.

[Damkid]

You do realize that rim size does not effect the speedo right? its the total tire diameter that matter, so a 15" rim with a low profile tire can potentially be shorter then a 13" rim with a tall tire on it

So it's all in a matter of what tire size you have for the rim you install

[Larry Hampton]

Sorry, I meant tires. The few 12" tires you can get are nothing like the 80k tires on my Sport Trac. It's looking like the Kumho's are MAYBE good for 20k. I don't want steel wheels and there are few 13, 14, and even fewer 15 inch tires similar in height. I'd like a better tire selection, therefore a larger wheel selection.

My only other alternative is to make a reduction gear box for the trans.

The nice thing about a trans swap is an engine swap.

[DON SVO]

Sorry, I meant tires. The few 12" tires you can get are nothing like the 80k tires on my Sport Trac. It's looking like the Kumho's are MAYBE good for 20k. I don't want steel wheels and there are few 13, 14, and even fewer 15 inch tires similar in height. I'd like a better tire selection, therefore a larger wheel selection.

My only other alternative is to make a reduction gear box for the trans.

The nice thing about a trans swap is an engine swap.

I'll put this out there...

I haven't had a speedo in either Festiva since 2008. I drive by the tach and know what speed I'm going based off that. Get whatever tires float your boat, drive by the tach.

[Advancedynamix]

I have a g series. With the capri speedo drive. I run 195/50r 15 and my speedo is within 1 mph @ 75mph

My speedo is dead on

So no one knows the answer?

I have to type out a big long explanation of what I want to possibly do?

EGT's came with 14's. Rio's have, what, 15's? I know people have put them in Festivas.

12" tires suck for longevity.

Two members gave you a valid answer. I'll be the third. A Capri xr2 trans (g5mr) will allow you to run a 22" outer tire diameter with the stock festiva gauge and cable and your speedometer will be just as accurate as it is stock. Mine is within 4 mph at 75mph but my tires are 21.5" tall. It says I'm going 4mph faster than I actually am. I'm pretty sure that the stock festiva tranny is closer with certain sizes of 13" wheels.

[Larry Hampton]

Well, first you have to have a tach.

Second, my wife has no idea how to drive by the tach.

Third, I don't want to use a GPS.

Fourth, I'm not looking for another idea, I just want to know the answer to my original question.

I'm 45 and been dinking with cars ever since I could drive. In the old days you could just get a different speedo gear for the end of your cable where it went into the trans.

My current 5-speed has a cracked case where the end detent is by a PO. I'm looking at changing it. I found a BP and trans from a EGT with under 20k on it for $400.

The speedo is within 1 mph at 75, what about other speeds? I don't often drive at 75, my speeds are typically 25-55 and I deal with a lot of speed traps.

IIRC, Damkid has a guage swap.

I'd like to get closer to a 23" or 24" tire.

[Nerd Racing]

look up the tire sizes that were OEM for the EGT and then swap in an EGT speedo Head to match your trans and you will be all set.

[georgeb]

Sorry, I meant tires. The few 12" tires you can get are nothing like the 80k tires on my Sport Trac. It's looking like the Kumho's are MAYBE good for 20k. I don't want steel wheels and there are few 13, 14, and even fewer 15 inch tires similar in height. I'd like a better tire selection, therefore a larger wheel selection.

My only other alternative is to make a reduction gear box for the trans.

The nice thing about a trans swap is an engine swap.

How about a reduction gear box for your brain? If it's 2 MPH off at 50 then it would be one off at 25 and 3 at 75. It's all proportional.