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 Which Transmission?

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s1l1sc



Posts : 402
Join date : 2011-11-05
Location : Rock Hill, SC

PostSubject: Which Transmission?   Mon Dec 12, 2016 2:32 pm

Which transmission is in the 1991 model wagons? 4L60E appears to be 1993+.
Is it the 700R4? Or the 4L60? Or are they the same thing?
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Fred Kiehl

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Join date : 2009-11-13
Age : 68
Location : Largo, FL 33774

PostSubject: Re: Which Transmission?   Mon Dec 12, 2016 9:21 pm

The 91-93s have a 4L60/700R4. LT1 cars have the 4L60e. The 91-93 cars have a manual shift cable, and the 94-96s have the computer do the shifting. The tail shaft housing can be different on different years of the 94-96s. The 91-93s are all the same.

The 91-93 cars have a gear driven VSS as well. If you are changing tire sizes, you should re gear the VSS. There are two types of VSSs, one for the 34-39 tooth driven gears, and one for the 40+ tooth driven gears. You can also get 15, 17, and 18 tooth drive gears. The driven gears are difficult to find, and do not have a shaft on them. The pinion gears are a little easier to get. There is a chart, and formula on the Speedometer World site to determine what gears to use with what gear ratio, and tire size. The 94-96s have a tone ring and pickup, so are not adjustable. They use the computer to modify the signal for the tire size, and gear ratio.

The gears are marked for # of teeth both with an embossed number, and by the color of the gear. The FSM also has some of the possible ratios and tire size combinations in the transmission section.
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s1l1sc



Posts : 402
Join date : 2011-11-05
Location : Rock Hill, SC

PostSubject: Re: Which Transmission?   Tue Dec 13, 2016 11:08 am

Thank you Fred.
Your help is much appreciated. I guess I am going transmission shopping.
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