New Gears-What Else Is Needed?
Thread Starter
Race Director
Joined: Dec 1999
Posts: 11,813
Likes: 32
From: Work
St. Jude Donor '09
New Gears-What Else Is Needed?
I am planning on going from 2.59's to 3.75's, what all is needed after the switch? Am I going to need to get my speedo recalibrated? All comments welcome.
Eric
Eric
Melting Slicks
Joined: Apr 2001
Posts: 2,877
Likes: 7
Re: New Gears-What Else Is Needed? (HOWSER)
Since you have a 93 you will need to get the new speedo gears that go on the tail shaft of the trans( i am assuming that the auto is the same as the 6spd,,) I got mine from doug rippe last year for around 100 bucks
Racer
Joined: Aug 2000
Posts: 491
Likes: 0
From: Houston, Texas
Re: New Gears-What Else Is Needed? (HOWSER)
A 3.75 is easier on your tranny than a set of 2.59's. The same amount of torque is transmitted to the trans by the engine but the car will "feel" lighter to the engine/trans with the 3.75's, so the trans works a lot less for the same acceleration.
Lower rearend gears (higher number) = less strain on tranny and more on pinion.
High Rearend gears (like 2.59) = more strain on tranny and less on pinion
[Modified by Red94Vette, 6:53 PM 6/4/2002]
Lower rearend gears (higher number) = less strain on tranny and more on pinion.
High Rearend gears (like 2.59) = more strain on tranny and less on pinion
[Modified by Red94Vette, 6:53 PM 6/4/2002]
Team Owner
Joined: Apr 2000
Posts: 27,818
Likes: 8
From: CT
Re: New Gears-What Else Is Needed? (Red94Vette)
Seeing you have a pre HPP adjustable tranny(just a tech term for a non 4L60E) you'll need a 3 series VSS(Vehicle Speed Sensor) and correct speedo gears. I'd highly recommend dealing with Jeff Kopp, aka 18carfan from Superior Chevrolet. He'll get you the right stuff and seeing you're a forum member, it'll be 10% above cost. Besides He's a super guy to deal with.
Tell Him JD sent ya.....Here's the e mail I use to contact him.
superchevyparts@mindspring.com
Tell Him JD sent ya.....Here's the e mail I use to contact him.
superchevyparts@mindspring.com
Drifting
Joined: Jan 2001
Posts: 1,669
Likes: 1
Re: New Gears-What Else Is Needed? (JD 90 383)
Actually not to start an argument, but Redvet is only half right. Yes it is better on the tranny, but not the rear. The D36 is weak to begin with, but with the 3.75 and having a small pinion, the pinion spins with enough torque to actually move the carrier backwards instead of turning it. This happens only when there is traction, and the reason it happens is becaues the housing is not beefy enough to keep it from happening. So when the ring gear moves away from the pinion it rips the teeth of the pinion and then everything else starts to grenade. I just saw a perfect example of this last week. The only thing you can do to prevent it is to buy a HD rear cover that has main cap blocks in it.
Racer
Joined: Aug 2000
Posts: 491
Likes: 0
From: Houston, Texas
Re: New Gears-What Else Is Needed? (snaketr)
I am 100% right, I put that it had more stress on pinion, i included that but I happened to type it backwards.. :lol: but you said it better
:yesnod:
[Modified by Red94Vette, 6:52 PM 6/4/2002]
:yesnod:
[Modified by Red94Vette, 6:52 PM 6/4/2002]
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