Transmission swap (1 Viewer)

Joined
Nov 1, 2006
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Maui, HI
I have a 84' BJ42 w/a 3B and 4 speed. I can get my hands on a 86' BJ60 w/a 6 cyl diesel (2H?) and a 5 speed cheep, cheep, cheep. Both trucks have the factory drive trains. I want to use the 5 speed in my BJ42. The questions is will the 5 speed from the 60 bolt into the 42. It's my understanding that they are both H55's but have different input shafts. Any comments? Any thoughts on dropping the 6 cyl into my 42?

Live long, have fun, catch waves
Steve
 
Joined
Nov 1, 2006
Messages
13
Location
Maui, HI
Correction to my last post. The truck w/the 5speed is a HJ60 I believe.
 
Joined
Sep 3, 2007
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Longmont, CO
 
 
The transmission from the HJ will have a different input shaft than the BJ version, so that will need to be swapped.

You'll also need to find a (quite rare) 40-series 5spd top cover for the transmission. You can use the 60-series cover, but will have to cut a hole in the tranny tunnel several inches further back and then bend the shifter to compensate.

Of course driveline lengths will need changing.
 

RufusTheDufus

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Jan 9, 2008
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Moronville, ME
 
 
swap the motor/trans into your 40. sell the 3b to cover the cost of the hj and the driveshafts mods you will need
This is a good idea, but there's a lot more involved than just an engine swap. New motor mount locations have to be fabricated. The exhaust runs down the opposite side of the engine on the 2H so a new exhaust needs to be fabricated and all of the stuff that's in the way needs a new home (vacuum tank and water separator come to mind.)


If you want to just use the transmission and transfer there's a bit to consider. I have never needed to purchase the 3B input shaft to convert the F/H style to the fine spline 3B style. I think the swap is fairly straightforward but the part is around $400. While you're in there you should consider installing a new seal between the trans and transfer case and do a rebuild on the tcase too. The parts for that are $200 to $250ish, I think.

With all this in mind does it still seem cheap?
 

RufusTheDufus

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I wasn't necessarily advocating rebuilding the transmission, just the transfer case. An alternative is to install one of those transfer case saver hoses and run it that way. It's a lot less aggravation and certainly less expensive.
 

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