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Old 09-17-2010, 08:10 PM
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T-400 fixed yoke question

I have a TH400 out of a 1987 3/4 ton suburban. The trans works well and appears to have a fixed yoke output. I'm curious if i could use this in my 81 malibu with a slip yoke type drive shaft? Also the trans has the letters HD cast into the top of the trans, does this mean anything? thank you.

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Old 09-17-2010, 08:38 PM
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Yes, with the correct slip yoke you can do this just fine. You have to have a yoke with the first 1" or so of the splines counterbored out smooth, so the yoke doesn't bottom out on the o-ring boss on the shaft at the top of the spline that is there to seal the fixed yoke.
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Old 09-17-2010, 08:45 PM
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Denny drive shaft has sold the proper yoke for many years.. very easy situation to deal with
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Old 09-17-2010, 11:11 PM
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Thanks for the responses, greatly appreciated
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Old 09-18-2010, 12:43 AM
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The HD cast in Case should indicate a Heavy Duty case which is thicker and has a Cast aluminum converter cover w/6 attaching bolts. There's an old thread on here w/Pics that shows the difference in the Case thickness of Bellhousing area.

More Info >> http://www.crankshaftcoalition.com/w...75.283L80HD.29
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Old 09-19-2010, 01:35 AM
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The HD will indicate a thicker case as indicated in the above post. However, it may be drilled for an aluminum dust cover (6 large threaded holes) OR it may be drilled for a tin or plastic dust cover (4 tiny threaded holes). Other than that, there is no significant difference between it and a case without the HD on it.
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