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You could use a dana 300 behind it to.

Flipped you could. The NP207 would last a few minutes behind a SBC. I killed one with my 4 banger in my '86! The std trans NP207 should be 21 spline deep and the 3 speed auto will be 23 spline shallow. NP207 went away after '87 AFAIK and replaced with NP231. Later 4 cyl with AW4 auto are 21 spline like the Renix 6 cyls. HO went to 23 spline deep and tcases became New Venture by '93.

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  • 4 weeks later...

What transfercase is on the 86' custom? I'm puting a 350 small block in my comanche and trying to see if the transfercase will fit with a sm420 or sm465.

 

You say you are putting a SBC 

 

 

If you are going that rout anyway why not go all Bowtie....hook up a Turbo 400 short shaft ( or comparible 4 speed standard)....that will give you the options of all the NP cases that GM used to run.....a 208 should be more than enough......bump it up to a 203 (might need a PT kit)......or go all the way with a 205 and never worry about stretching or breaking a chain again.  :rock on:

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