speedo gear for 2.77 to 3.45?
Thread Starter
Junior Member
Joined: Nov 2000
Posts: 62
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From: Benbrook, Texas
speedo gear for 2.77 to 3.45?
I just did the 2.77 to 3.45 swap and I need to find the right speedo gear because the mph is way off. What gear do I need, Where do I get it from, And how much does it cost?
any help is appreciated
Clint
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89' 5.7L TPI Auto IROC American Racing Torque-thrust 2 rims
,Ported Plenum,Accel/Lingenfelter Runners,
Flowmaster, high-flow converter, SLP headers, B&M console megashifter, MSD 6aL, airfoil, K&N's,Gutted airbox, Bosch Platinum +4, 8.8 wires,Accel Coil
any help is appreciated
Clint
------------------
89' 5.7L TPI Auto IROC American Racing Torque-thrust 2 rims
,Ported Plenum,Accel/Lingenfelter Runners, Flowmaster, high-flow converter, SLP headers, B&M console megashifter, MSD 6aL, airfoil, K&N's,Gutted airbox, Bosch Platinum +4, 8.8 wires,Accel Coil
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
They're a few bucks from GM. Need to know your tire size to figure out what gears you need.
Senior Member
Joined: Jul 1999
Posts: 994
Likes: 0
From: San Diego, CA
Yes, from the GM dealership.
If you have 245/50/16 tires, you need:
15T Gray Drive Gear, 8642620
42T Green Driven Gear, 1362049
------------------
1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System
If you have 245/50/16 tires, you need:
15T Gray Drive Gear, 8642620
42T Green Driven Gear, 1362049
------------------
1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System
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