D36 3.73
Thread Starter
4th Gear
Joined: Apr 2009
Posts: 4
Likes: 0
From: melbourne
D36 3.73
Looking into changing gears on a D36 from std to 3.73. Wondering what final drive rpm i'll get. When ordering gears do I also need to order the carrier.
It is a 4 spd auto c4 vette 84 model.
Cheers, Jev.
It is a 4 spd auto c4 vette 84 model.
Cheers, Jev.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Some LT1 owners with the A4 find 3.73's work well, but doubt they would be a good choice with a crossfire, even too steep for the L98's due to the torque curve.
I tried the ratio in my 93 with LT1 power and found the high RPM annoying at freeway speed, I have since changed to 3.45.
I believe you will find 3.07 to be a better choice.
I tried the ratio in my 93 with LT1 power and found the high RPM annoying at freeway speed, I have since changed to 3.45.
I believe you will find 3.07 to be a better choice.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Instructor
Joined: Sep 2004
Posts: 208
Likes: 1
From: Lawrenceville GA
2500 rpm nets 73 mph with my 3.73. At least that's what the gauges said. My usual mpg is 15 - 18 if I get on the freeway. I like the 3.73 and my shift kit...closest I'll come to a race track feel.
Pro
Joined: May 2006
Posts: 637
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There is a difference, but I thought it would be more.
Anyone know of a way to calculate this for every final gear?
Or if there is a formula for this?
Pro
Joined: Aug 2004
Posts: 549
Likes: 13
From: Richmond VA
Burning Brakes
Joined: May 2000
Posts: 1,243
Likes: 1
From: Charlotte, NC USA
3.73's may be a bit much for a stock Crossfire. I am running 3.45's in my 84... I have been quite satisfied with the overall "feel" with this ratio. Your 84 came stock with 3.07:1 gears.
My Crossfire is basically stock except for a ported intake and .030 over bore.
Jack
My Crossfire is basically stock except for a ported intake and .030 over bore.
Jack
Team Owner
Joined: Dec 2007
Posts: 20,974
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there is a guy on DC vettes that has them in his 84 and loves them. He posted a youtube video a while ago with them, and they are nice even for that car. there are not many c4 videos with gears, I will see if I can find it, but it looks like a blast, it's playing with a ta orsomething.
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Thread Starter
4th Gear
Joined: Apr 2009
Posts: 4
Likes: 0
From: melbourne
Thanks for the info so far guys. Do I need to change the carrier or can I just order a set of gears and bearings. There is bugger all info here in Australia on this. Been quoted bit over a $1000 for gears alone and $350 for carrier and $350 for bearing set.
Should have mentioned earlier, I pulled off the injection and now has a 650 vac sec, roller rockers and a good cam.
Should have mentioned earlier, I pulled off the injection and now has a 650 vac sec, roller rockers and a good cam.
4th Gear
Joined: Nov 2007
Posts: 4
Likes: 0
hi guys, no 1 said if you can put 3.73's in the 2.59 pumpkin as a straight swap? i was looking to do that swap also and wanted to know what was involved as far as keeping or replacing the carrier and how involved it is. is it something i could myself or would i have to bring it in?
thanks in advance
thanks in advance
Le Mans Master
Joined: Dec 2004
Posts: 5,488
Likes: 1,352
hi guys, no 1 said if you can put 3.73's in the 2.59 pumpkin as a straight swap? i was looking to do that swap also and wanted to know what was involved as far as keeping or replacing the carrier and how involved it is. is it something i could myself or would i have to bring it in?
thanks in advance
It depends on what carrier you have now, if you have a 2.59 you can order a 3.75 rear gear from Richmond I have 100 passes on mine with no issues and NO whine.
thanks in advance
It depends on what carrier you have now, if you have a 2.59 you can order a 3.75 rear gear from Richmond I have 100 passes on mine with no issues and NO whine.
Drifting
Joined: Sep 2002
Posts: 1,642
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From: Suwanee,Ga
Summit will sell and ship. $350 + frt.
Richmond 3:54 or 3.75 Ring and pinion.
The 3.75 will get you 107mph @ about 5200rpm in 3rd gear
3.54 about 113mph
That should about your terminal velocity in 1/4.
TJM
PS yes they fit a DANA 36
Richmond 3:54 or 3.75 Ring and pinion.
The 3.75 will get you 107mph @ about 5200rpm in 3rd gear
3.54 about 113mph
That should about your terminal velocity in 1/4.
TJM
PS yes they fit a DANA 36
Team Owner
Joined: Dec 2007
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Safety Car
Joined: Jun 2006
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From: FL
Burning Brakes
Joined: May 2006
Posts: 985
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From: St. Louis Missouri
I had to buy a ring and pinion set with a thick ring gear to go from 2:59 to 3.73. As far as durability, I stripped one of the pinion gears at the track one evening and had to drive it home. I replaced that gear and haven't had a problem as of yet. I have a D44 when I get around to it.
Le Mans Master
Joined: Nov 2006
Posts: 5,032
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From: Greenwood Indiana
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So, I know they make them. Availability may be another story, though.
