Transfercase

[350MJ]

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.

[Minuit]

The part-time case up until '87 was the NP207. I believe the 242 was the full-time case throughout the lifetime of the MJ.

[jimoshel]

The 207 was used with manual transmission. Auto used either the 207 or the 228. Adapters are available for the sm420 and 465.

[350MJ]

thanks

[87manche1]

You could use a dana 300 behind it to.

[carnuck]

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.

[mvusse]

New Venture and New Process are the same company anyway. They just changed the name.

[Pete M]

before you get too carried away with the 207, the 87+ np-231 is a stronger unit and has more aftermarket support.  :thumbsup:

[dasbulliwagen]

Neither the 207 or 228 are good cases. I had a 228 blow up on me just driving down the street at 30 mph. Find something different.

[carnuck]

228 usually doesn't die unless there are mixed axles, mixed tire sizes or no oil in them

[yxmj]

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:

[Eagle]

The part-time case up until '87 was the NP207. I believe the 242 was the full-time case throughout the lifetime of the MJ.

 

The 242 didn't come in until the 1987 model year. Selec=Trac for the 1986 was the 228.