Rear Gears ('89 vette)
Thread Starter
Melting Slicks
Joined: Feb 2015
Posts: 2,069
Likes: 262
From: Park Ridge New Jersey
Rear Gears ('89 vette)
While I try to figure out the engine work and the car is at the mechanics, I was thinking I'll start work on something I'm going to change, the rear gears.
It is an automatic with a 2800 stall converter, I'm not sure of the stock gears, but I don't want to do a drastic/problematic jump (not sure 3.54 or 3.73). Can I get a good ratio recommendations and a place to buy them? I'd like to order them tonight.
TIA
It is an automatic with a 2800 stall converter, I'm not sure of the stock gears, but I don't want to do a drastic/problematic jump (not sure 3.54 or 3.73). Can I get a good ratio recommendations and a place to buy them? I'd like to order them tonight.
TIA
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
While I try to figure out the engine work and the car is at the mechanics, I was thinking I'll start work on something I'm going to change, the rear gears.
It is an automatic with a 2800 stall converter, I'm not sure of the stock gears, but I don't want to do a drastic/problematic jump (not sure 3.54 or 3.73). Can I get a good ratio recommendations and a place to buy them? I'd like to order them tonight.
TIA
It is an automatic with a 2800 stall converter, I'm not sure of the stock gears, but I don't want to do a drastic/problematic jump (not sure 3.54 or 3.73). Can I get a good ratio recommendations and a place to buy them? I'd like to order them tonight.
TIA
It sounds as if "the cart is before the horse"!
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
you need to know your starting series 1st. As above mark your Drive shaft \ Diff and tire with chalk, white out, put the car in "N" helper spins the wheel constant & smooth count the DS turns. narrow your results Example 2 full turns just missed 2.5 = apprx 2.45
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
We also need to know what your mods are and what your goals are for the car. Do you still have a TPI style intake? Are you looking for a stop light warrior, 1/4 mile improvement, road course, AutoX, etc.? All these things will effect recommendations for rear gears.
Thread Starter
Melting Slicks
Joined: Feb 2015
Posts: 2,069
Likes: 262
From: Park Ridge New Jersey
I'd like to build a streetable/stop light warrior/cruiser
I have CAI, Borla catback and a 2800 TQ converter
my plans are:
intake, cam and headers
TIA
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
If you still have stock gears in your car , they should be either 2:59 or 3:07 gears..These were the choices for the autos....I believe 3:45 is the lowest most guys go with the automatics...WW
Last edited by WW7; Feb 9, 2015 at 05:43 PM.
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
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Thread Starter
Melting Slicks
Joined: Feb 2015
Posts: 2,069
Likes: 262
From: Park Ridge New Jersey
Thread Starter
Melting Slicks
Joined: Feb 2015
Posts: 2,069
Likes: 262
From: Park Ridge New Jersey
Now that that is confirmed, what size/brand/place to buy is recommended? I could really use direction here. I emailed OBX headers, no reply yet(which I find shocking).
BTW vader, love the website its very informative
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
Not sure, that is why I'm asking advice (engine) in another thread. So far, I'm going to do the intake, cam and headers.
Now that that is confirmed, what size/brand/place to buy is recommended? I could really use direction here. I emailed OBX headers, no reply yet(which I find shocking).
BTW vader, love the website its very informative
Now that that is confirmed, what size/brand/place to buy is recommended? I could really use direction here. I emailed OBX headers, no reply yet(which I find shocking).
BTW vader, love the website its very informative
it was a burnout king at the track. Would not hook up 125' or so out.
pretty useless!!!!
are you keeping TPI?
what Cam? Hot cam?
these will need to be answered due to power band range.
OBX never responds I have been trying about 6 months. Not one reply from them????
Thread Starter
Melting Slicks
Joined: Feb 2015
Posts: 2,069
Likes: 262
From: Park Ridge New Jersey
3:45 range is very ideal. But like one of my TPI builds years ago, I had 3:45's with a CC 306 and mild moded 355 Auto with 2800 stall full Man valve body
it was a burnout king at the track. Would not hook up 125' or so out.
pretty useless!!!!
are you keeping TPI?
what Cam? Hot cam?
these will need to be answered due to power band range.
OBX never responds I have been trying about 6 months. Not one reply from them????
it was a burnout king at the track. Would not hook up 125' or so out.
pretty useless!!!!
are you keeping TPI?
what Cam? Hot cam?
these will need to be answered due to power band range.
OBX never responds I have been trying about 6 months. Not one reply from them????
Cam - same as the TPI, nothing too nuts
OBX is going to lose a customer as I go with the TPiS set
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Superram/modded TPI-style = keep it 3.07, just swap to D44 when money allows.
MR = I'd go with a 3.54 in an automatic I drive alot.
MR = I'd go with a 3.54 in an automatic I drive alot.
Burning Brakes
Joined: Oct 2010
Posts: 1,037
Likes: 28
From: Montclair New Jersey
I just did a 3.54. I had a 3.07. The change wakes the car up a lot. I might have done a 3.73. Just my opinion
Instructor
Joined: Sep 2011
Posts: 140
Likes: 7
From: Fort Ripley Minnesota
Hawk196,
It appears that you are going to mod your car, to what degree we aren't sure. If your looking at changing the rear gears I would strongly suggest changing the complete rear with a DANA 44. if your going to increase Hp and performance.
Its almost impossible to find replacement spiders for the DANA 36 these days, if you should happen to break one your gear change is for not.
The DANA 44 swoop is much easier then some people lead you to believe, the only bad part is that if we keep recommending the upgrade, there wont be any left...
It appears that you are going to mod your car, to what degree we aren't sure. If your looking at changing the rear gears I would strongly suggest changing the complete rear with a DANA 44. if your going to increase Hp and performance.
Its almost impossible to find replacement spiders for the DANA 36 these days, if you should happen to break one your gear change is for not.
The DANA 44 swoop is much easier then some people lead you to believe, the only bad part is that if we keep recommending the upgrade, there wont be any left...
Pro
Joined: Nov 2009
Posts: 583
Likes: 0
From: Maple Grove Minnesota
Racer
Joined: Dec 2007
Posts: 416
Likes: 3
If you don't know what induction you're going to use (or anything else) the last you need to do is talk to a header manufacturer. They can't give you a recommendation based on what modifications you've decided on in this thread.
Instructor
Joined: Sep 2011
Posts: 140
Likes: 7
From: Fort Ripley Minnesota
The only issue I had was putting synthatic oil in it the first time, the clutches chattered terriblely. Put plain old GO 85W140 with GM additive and life is good no more chatter.