C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Tranny swap?

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Old Jul 16, 2009 | 09:56 PM
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Default Tranny swap?

Can I swap a 4L60E into my 85 with a 700r4?
I know I will need a TCI or the likes controller but just want to make sure it will fit. And will I need a new drive shaft?

my 700r4 is fine I just dont feel like messing with the govnor weights and will be upgrading to some better power and dont want it blowing up on me
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Old Jul 17, 2009 | 12:23 AM
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If it has the same bellhousing ( not LSX style) should be bolt in swap.Will need to reuse C4 tailshaft ext housing on new trans unless 4L60E came out of a C4.
Yoke the same 27 spline unit
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Old Jul 17, 2009 | 12:31 AM
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Originally Posted by rodj
If it has the same bellhousing ( not LSX style) should be bolt in swap.Will need to reuse C4 tailshaft ext housing on new trans unless 4L60E came out of a C4.
Yoke the same 27 spline unit
30 spline is stronger right? I was thinking about doing a D44 swap with 3.45 or so gears.
Worth it?
I just want perfect shift points
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Old Jul 17, 2009 | 04:33 AM
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Originally Posted by 383tpimachine
30 spline is stronger right? I was thinking about doing a D44 swap with 3.45 or so gears.
Worth it?
You are getting confused with the convertor splines.
Early T700 had 27 splines; changed to 30 spline with all the upgrades in '88?
Output shaft on all is std GM 27 splines; same as used in late P/glide . TH350 ,4+3 ,etc.
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Old Jul 20, 2009 | 12:44 PM
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I swapped it and you have to note a couple of things.

1. IIRC, the output shaft may be of different length
2. The tailhousing is different.
3. The tailhousing bolts are different.
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