gear ratio question.

[tenn-gsx]

Ok i have an odd question and i have no clue how to calculate the answer my self. What rear diff gear ratio would you need if you were to put a 95 t case on a 97 transmission in order to keep the front and rear wheel speed identical?

 

[bryanwheat]

The rear differentials are the same. You match the transfer case to the transmission. Unless you are going to buy a custom ring gear and pinion which will cost more than buying the correct transfer case than it won't work. The other option is to open the transmission case and swap out the ring gear and final drive out.

 

[tenn-gsx]

I know the rear diffs are the same. The Dsm rear ratio is an odd ratio. I want to know what ratio would ne needed if i used a 97 trans and a 95 diff because that may be a more common ratio to find when swapping to a stronger chevy or ford rear diff. Right now this is purely academic.

 

[Mr PopUps]

Why would you need to swap to a diff diff? Mids 7's can be done on a stock rear end...just ask Shep. And IIRC the final drive is like 2.64.

 

[DSMReviver]

Mr. Pop shep was already on solid rear when he did high 7's i believe. IRS was already gone and solid axle already in.

Tenn, sounds like you want to use 95 tcase with 97 trans correct?

In that case, you would need to switch your ring and pinion in the 97 trans to 58 tooth count gears. 97 and up models have 57 tooth ring and pinion gears. you cannot use 95 tcase unless you do that to your 97 trans.

here is more info on that

The front differential transmission ring gear part numbers are as follows (from twicks69) :

1989-1991.05.2 - MD726425 = 58-teeth
1991.05.3-1996.06.3 - MD748872 = 58-teeth
1996.07.1-1999 - MD770499 = 57-teeth

It going to be alot of work to swap the ring and pinion. You better off finding 97 tcase.

The rear dsm LSD diff gear ratio you maybe looking for is 3.545 (Manual car)

 

[tenn-gsx]

No. I want to know what gear ratio is needed to run the 97 transmission with the 95 transfer case.
I DO NOT plan to use a mitsu diff. I realize how impractical it sounds. I just want the gear ratio that would be needed to accomplish this. The point here is to use a different manufacturers rear differential in a custom rear subframe. So the mitsu rear differentials are irrelevant to me.

 

[DSMReviver]

No. I want to know what gear ratio is needed to run the 97 transmission with the 95 differential
I DO NOT plan to use a mitsu diff. I realize how impractical it sounds. I just want the gear ratio that would be needed to accomplish this. The point here is to use a different manufacturers rear differential in a custom rear subframe. So the mitsu rear differentials are irrelevant to me.

The rear diff is 3.545 ratio for all manual model dsm.

 

[tenn-gsx]

I know what the rear diff ratio is. I dont care what mitsu rear gear ratios are. I had a typo. I dont know if im not doing a good job explaining this. I plan to build a custom subframe to accomidate a ford or gm rear diff. The3.545 ratio is an an oddball ratio. So im wondering what eatio it would take to run the 97 transmission with a 95 transfer case. Because im hoping it will end up being a common ratio like 3.73 or so. Does this make sense now?

 

[DSMReviver]

Buddy,

I've given you ring and pinion gears need to run in your transmission, I've given you the differences between the transfer case, and i've given you rear end ratio.

The only thing i haven't given you is transfer case ratio 1.074 for a 97-99 awd manual. 91-96 awd manual is 1.090.

is this what you seek?

:EDIT Ratio:

 

[tenn-gsx]

No its cool. Thanks for trying to help. My issue is that i dont know how to calculate the gear ratio i would be looking for. And im not sure how to explain what im trying to ask any better than i have. Again thanks for trying to help me out though.

 

[DSMReviver]

No it cool bro. I know what you mean now.

Here are a several links to help you understand how to calculate gear ratios. This should get you started.VV

Gear Ratio Calculations

HowStuffWorks "How Gear Ratios Work"

This last one is a calculator VV

http://www.csgnetwork.com/rnggrpinioncalc.html