best gears for my 92

cobradude360 · #1 03-13-2006, 02:00 PM

first off im lookin for pro advise like from mod mech, way to old, bigger john where ever the hell he is and any one else i forgot. ok so here it is ive got my 1992 merc gm stock trans and have done some intake work and exhaust work nothing to drastic to the engine and now im lookin to beef up the rear end i beleave its got 308's in it right now not sure what do you think the best gearing would be to put in there in the near future i am going to be rebuilding the trans and eather the jmod or a shift kit so whats your opinion

way2old · #2 03-13-2006, 05:42 PM

That depends on what you are wanting to do. Top end or quick to fast. 3;55 is a good choice for quick to fast. However you will be limited on top end. 3:23 is good all around. Tops out about 130 and has good fuel mileage. Not as quick though.

amo4387622 · #3 03-13-2006, 06:31 PM

Well like way2old said it depends on what kind of drving you want top end or off the line fun. But 3.55 is good all around gear for highway and street driving pretty much what a lot of police CV's have in them. 3.73 some highway but a little more for street. Or 4.10 more of a street gear and very little highway. and you will see you rpm's increase around 300-600 rpm's with the 3.73 and 4.10 but that also depends on the car too might be a little more or a little less.

cobradude360 · #4 03-13-2006, 07:03 PM

sry amo forgot about you im lookin for some speed but aalso want to beable to taake off quick with still gettin good gas milage and i really dont care bout top end because as all of you will probly agree no one has any buisness doin over the speed limit let alone 100 mph so hes what i got im thinkin the 3.55's what do you all think

amo4387622 · #5 03-13-2006, 07:08 PM

For what you want your best bet is the 3.55.

cobradude360 · #6 03-13-2006, 07:11 PM

alright then i think thats what i will go with thank you way2old and amo for all your help

cobradude360 · #7 03-13-2006, 07:19 PM

alright then i think thats what i will go with thank you way2old and amo for all your help

cobradude360 · #8 03-13-2006, 08:23 PM

another thing i have the digital speedo will it mess with the speedo at all with the 3.55 because they have the 3.08 in it right now so thats a jump

amo4387622 · #9 03-13-2006, 10:43 PM

I am not 100% sure but I think you will be ok with the digital speedo. But to be on the safe side call your local installer that does rear ends or even call a trans place and ask them they will be able to tell you. All I do know is that when I did my gears on my 90 CV I had to replace the stock speedo gear on my AOD trans.

way2old · #10 03-14-2006, 09:17 AM

You will need to change the gear on the speed sensor to make the speedo be at the correct mph.

ModMech · #11 03-17-2006, 02:06 PM

I have owned CVs with 2.73s (best mileage), 3.08s and 3.55s (WORST mileage).

I had 3.55s and 3.08s in the same car (1999 CVPI) and it was taken to the track a few times. There is NO difference AT ALL between 3.08 gears and 3.55s in 1/4 miles times. At the 1/8 mile you can see a slight difference, with the 3.55s being quicker. It is not worth the -2 MPG of the 3.55s for that slightly quicker acceleration IMO.

I would say that 3.27 gears offer the best balance between economy and acceleration (Ford apparently agrees as those are "standard" gears for the Sport and CVPI, with 3.55s being optional for the CVPI (city police)).

The difference between 3.08 and 3.27 is very minimal, and not worth the expense of changing.

cobradude360 · #12 03-17-2006, 02:18 PM

so basicly what you are saying is forget the gears what would be a got mod slash thing to do to it that would be worth it

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