2004R Speedometer Calibration - Chevelle Tech
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post #1 of 4 (permalink) Old Jun 4th, 06, 1:07 AM Thread Starter
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2004R Speedometer Calibration

I just finished putting a 2004R in my 86 Cutlass. I removed it from a 88 Monte Carlo LS. The speedo in the Cutlass is now 20-25 MPH off (reading higher). The cutlass has 3.73 gears in it, not sure what the Monte Carlo had. Is it possible to fix this by changing the cable gear? I can't change the one on the tailshaft since the housing doesn't come off like a TH350 or TH400.

Tom Rightler, MCC VP & Newsletter Editor
1970 SS Best ET: 12.31@108 MPH
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post #2 of 4 (permalink) Old Jun 4th, 06, 1:20 AM
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Jake
 
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Re: 2004R Speedometer Calibration

The speedo gear on a 200-4R is on the governor. You can change it but it requires removal of the pan, govenor cover, governor, and partial disassembly of the governor. New gears are about $40 each from GM for the 200-4R drive gear
To make such a drastic difference you will likely need to change the drive gear.

What tire size do you have now, and you are sure you have 3.73's right?

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post #3 of 4 (permalink) Old Jun 4th, 06, 9:54 AM Thread Starter
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Re: 2004R Speedometer Calibration

Right now it has 255 60 15's on the back, but those are about bald so they will need to be changed soon. Yes I am positive it has 3.73's in it, I put the rear in it.

Tom Rightler, MCC VP & Newsletter Editor
1970 SS Best ET: 12.31@108 MPH
1969 Malibu
1969 Dodge Charger
1970 Chevelle Convertible
Maryland Chevelle Club
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post #4 of 4 (permalink) Old Jun 4th, 06, 12:04 PM
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Jake
 
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Re: 2004R Speedometer Calibration

If you plan on keeping the 255/60-15's, or a tire with the same overall diameter which is approx 27", you need a 10 tooth drive gear which is green for the 200-4R and original to the Monte Carlo SS's, and a 28 tooth driven(yellow).


You could get by with an 11 tooth drive gear (orange) and a 31 tooth driven (white).

I would pull your existing driven gear and look in the hole with a flashlight and see what you have for a drive gear.

GM P/N's are 416765 is the 28 tooth driven about 5 bucks at the dealer.
8639906 on the 10 tooth drive gear, lists for $42.

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