Auto Trans
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From: Northwest US
Auto Trans
Mine is a 66 f-100 short box 4whl dr. with 300 cu in 6. New Process 435 tranny
and Dana 21 transfer case.I have done a bumper to bumper restoration with extensive engine work. Except, failed to go thru transmission, which now needs attention. Question is: Has anyone been successful installing an automatic transmission behind this engine, in this application. I realize this is a "cart before horse" situation, but I'm stuck with the error of my ways. If any one has
attempted a similar swap I would be interested in any thoughts you may have
about attempting this job. Keep in mind, the body and paint work is completed.
Thanks for your time. Jackpot
Reposting to see if anyone out there has ever attempted or heard of someone who has attempted this type of tranny change. The silence I have received on my original thread probably gives me my answer. Just on the off chance before I pull my NP 435 for rebuild I thought I would give it this last try. Thanks Guys!
and Dana 21 transfer case.I have done a bumper to bumper restoration with extensive engine work. Except, failed to go thru transmission, which now needs attention. Question is: Has anyone been successful installing an automatic transmission behind this engine, in this application. I realize this is a "cart before horse" situation, but I'm stuck with the error of my ways. If any one has
attempted a similar swap I would be interested in any thoughts you may have
about attempting this job. Keep in mind, the body and paint work is completed.
Thanks for your time. Jackpot
Reposting to see if anyone out there has ever attempted or heard of someone who has attempted this type of tranny change. The silence I have received on my original thread probably gives me my answer. Just on the off chance before I pull my NP 435 for rebuild I thought I would give it this last try. Thanks Guys!
Last edited by jackpot; Dec 16, 2013 at 11:41 AM. Reason: Repost
Lead Gopher
Joined: Aug 2012
Posts: 10,065
Likes: 1,615
From: Seattle
You can shift an automatic yourself, too. If you don't have a working modulator or a working kick-down switch or lever then you end up needing to do a LOT of shifting. That's sort of what caused the failure of my column bowl when bringing my one truck back from Cali.
If I'm not mistaken the 66 F100 Dana 21 is a "married" transfer case, rather than a "divorced" transfer case like the Dana 24. You'd be on the lookout for an automatic that bolts to the back of the 300 and will connect to a married Dana 21 transfer case. I'm not aware of any, but perhaps others will chime in.
Part of the problem as I envision it is that most automatics have a longer housing that the NP435, which is fairly short from input to output. So, if true that would push your transfer case back which would mean modifying your driveshafts. Again, doable, but not easy or cheap.
If I'm not mistaken the 66 F100 Dana 21 is a "married" transfer case, rather than a "divorced" transfer case like the Dana 24. You'd be on the lookout for an automatic that bolts to the back of the 300 and will connect to a married Dana 21 transfer case. I'm not aware of any, but perhaps others will chime in.
Part of the problem as I envision it is that most automatics have a longer housing that the NP435, which is fairly short from input to output. So, if true that would push your transfer case back which would mean modifying your driveshafts. Again, doable, but not easy or cheap.
Thread Starter
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Junior User
Joined: Feb 2005
Posts: 60
Likes: 0
From: Northwest US
Auto Trans
You are spot on with your comments about tranny lengths and transfer case types. Thank you for the response. I have a feeling I'll be rebuilding the 435.
Just to many obstacle to overcome being so late in the restoration.
Just to many obstacle to overcome being so late in the restoration.
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