What is the difference between a Festy 5-spd & an Aspire one?

[Larry Hampton]

Remember this too Larry, in the future you don't have to overthink things like this, that's what you have guys like us for ;-)

Ahh, see I'm not a FWD guy. I've never heard the term "final drive" before.

If someone said "final drive = rear end gear" I would have known.

So if the Festy is 3.77:1 and the Aspire is 4.08:1 (or whatever they were), the only way the speedo reads right is to use the Aspire wheels. If you just do a tranny swap, and use the stock 155/80/12, the speedo would read wrong, right? Or does it read off the final drive?

DOH!!! Didn't read down far enough!!

[nitrofarm]

Run the speedo gear that came in the Aspire tranny.

Pardon me for getting this possibly mixed up, are you saying that 5th is lower numerically on the Aspire that the Festy? Like .76:1 vs .82:1

It would seem to me that if the Aspire tires are taller, then the speedo would be off. In otherwords, maybe the speedo itself is different.

Yes Larry you are right. Just make sure you switch over to the Aspire speedo gear.Then you'll be very close.I'm running the Festy Tranny in my Aspire.
With 175/70r13's which is one size up from stock. @ 65mph indicated, I'm doing 65mph actual.

[iceracerdude]

The fifth gears are the same as well as the speedo gears. The change happens as a result of one diff carrier (aspire) spinning slightly faster than the other one in relationship to RPMS. The aspire diff turns/rotates more times per mile than a festy diff did IF the tires you used were the same diameter in both cases...but alas, the aspire tires are slightly larger and rotate fewer times per mile, while festy tires are slightly smaller and rotate furiously per mile.
I think you're visualizing it now.

Check out this 1010 tire calculator, I use it all the time to compare rim/tire/diameters all the time. You can do 5 at a time!

http://www.1010tires.com/tiresizecalculator.asp

[Larry Hampton]

Yes Larry you are right. Just make sure you switch over to the Aspire speedo gear.Then you'll be very close.I'm running the Festy Tranny in my Aspire.
With 175/70r13's which is one size up from stock. @ 65mph indicated, I'm doing 65mph actual.

Nitro, are you still wanting that quarter in behind the passenger door?

I lost the pic, email me a taped off are photo to larryhampton1967@att.net and I'll return the same off my parts car.

[russian]

Maybe that's a mistake, anywho, go here and see

http://www.fordfestiva.com/forums/sh...t=40587&page=2

Not a mistake - festiva mount is taller so it would raise that corner of the engine, which seems to be OK if you have the stock engine. If you have BP you might not have enough room on the alternator side so you will need to drill a hole to prevent engine lifting.

[nitrofarm]

I'm good thanks

Nitro, are you still wanting that quarter in behind the passenger door?

I lost the pic, email me a taped off are photo to larryhampton1967@att.net and I'll return the same off my parts car.

Larry i bought Mckabes car. I'm cutting it up as we speak. Thanks though :p

[nitrofarm]

Gottcha

The fifth gears are the same as well as the speedo gears. The change happens as a result of one diff carrier (aspire) spinning slightly faster than the other one in relationship to RPMS. The aspire diff turns/rotates more times per mile than a festy diff did IF the tires you used were the same diameter in both cases...but alas, the aspire tires are slightly larger and rotate fewer times per mile, while festy tires are slightly smaller and rotate furiously per mile.
I think you're visualizing it now.

Check out this 1010 tire calculator, I use it all the time to compare rim/tire/diameters all the time. You can do 5 at a time!
http://www.1010tires.com/tiresizecalculator.asp

So they compinsated for final drive differnce with tire size. Thanks DUDE