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ducmon900 02-15-2001 10:16 AM

amc turbo400/gm 400????
Will a 73 amc tubro 400 interchange with a gm turbo 400 as far as the adapter to the dana 20? I guess what I'm asking is can I take a 73j trucks dana 20 and adapter and bolt it on to a gm turbo 400? Does this sound right?

**DONOTDELETE** 02-15-2001 01:09 PM

Re: amc turbo400/gm 400????
It may depend on whether the GM400 is a 2WD or 4WD model. The actual bolt patterns should be the same 6 hole pattern so the D20 adapter would mount up fine to either GM 400. The potential problem area I think is the tailshaft.

I think the 2WD GM model with its tailshaft will bolt right up to the D20 adapter and D20 case. The reason I say this is I know my tranny guy used a standard 30 spline 2WD output shaft when he changed out the 10 splined q-trac tailshaft on my amc400. We compared the 2WD shaft to the shaft on my donor J series amc400 and they were the same spline count and length. The only difference was the 2WD shaft had a speedo gear on it, but it was not in a place that interfered with any thing on the D20 adapter or D20 case. I dont know if the GM 4WD shaft is the same length or not
Hope this helps.

77 CJ7, D44s, Detroits, 4:27s, 35 SSRs, HS9500i
84 CJ8, 33s, REP8000
70 Commando

**DONOTDELETE** 02-15-2001 01:41 PM

Re: amc turbo400/gm 400????
I used an amc th400 that had the d20 adapter and put it on a chevy TH400 trans. Everything bolted up fine. TH400 is TH400 as far as everybody told me... :)

84CJ7 SOA,35's,OnboardAir,Dual winches,Full Cage,Snorkels, and more
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ducmon900 02-15-2001 11:07 PM

Re: amc turbo400/gm 400????
Well thats what I was hoping to hear. Sounds like an easy swap then. thanks ken

"I shouldn't say easy cause nothing is easy"

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