would like to replace 79 CJ7 motor with Ford motor - JeepForum.com
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post #1 of 7 Old 05-03-2009, 04:10 PM Thread Starter
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1979 CJ7 
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Location: Michigan
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would like to replace 79 CJ7 motor with Ford motor

I have a 79 CJ 7 we are rebuilding. We found out that the engine (a 258 straight 6) is gone. We are trying to decide what to do next. Money being tight, we thought about using our rebuilt 69 Ford 300 straight 6 and adapting it to the tranny in the Jeep. I am not sure what kind of tranny it is but the numbers are 13-01-065-906 Borg Warner (11-78). Possible T-18? Or, we could get an already rebuilt block for $1300 or rebuild ourselves. I am not sure what we need to adapt the Ford engine to the tranny and if it would be less costly. Any ideas on this would be great. Thanks

Last edited by alisa65; 05-03-2009 at 04:19 PM. Reason: wrong year
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post #2 of 7 Old 05-03-2009, 04:34 PM
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1986 CJ7 
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not sure about the straight 6 but i have a 302 v8 in mine and bolts right to the ford bellhousing. check this site http://www.novak-adapt.com/
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post #3 of 7 Old 05-03-2009, 07:26 PM
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1986 CJ7 
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Well if you ave a T18 Check the input shaft stick out. I think Ford and Chevy have a 6 1/2" stick out. If the Jeep is one of the long ones not that hard to change it out. Ford made a lot of F100-F250 trucks with the 300 6cly backed by a T18 or T19 trans so the bellhousing would not be hard to come by. If you can weld mounts should not be all that hard to fab up. If You have the long input shaft get a Ford 2 wheel drive T18 and swap the main shaft from the Jeep trans to the Ford. You most likely have the Dana 20 transfer case and the rear bearing sticks out of the case somewhat. The 1" stock adaptor you have now sets over the rear bearing centering it and all you have to do Is set it on the 2 wheel drive trans and clamp it down, Use a self centering punch and mark the 5? bolt holes. Stand it up in a drill press and drill and tap the holes. Really it is easy to do. I have done it and it works beautifully. Cheep way to replace the trans if the main shaft is good as around here you can pick up a T18 Ford trans 2 wheel for about 50 bucks but you say 4x4 and the price just tripled if you are lucky. You already have the adaptor and the main shaft they would sell you in a adaptor kit , so a small parts kit and the bearings and you would be on your way. You may get lucky and have the 6 1/2" stick out already then just need a bellhousing and you are out the door.
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post #4 of 7 Old 05-04-2009, 06:06 AM
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Cheapest solution is to rebuild/replace the existing 258, either DIY or purchase a long block. Followed by:

4.0L swap.
AMC V8 swap.
SBC swap.
SBF swap.

After those, you lose most (if not all) of the aftermarket support for swaps, and are on your own for Hack Fab'n parts.

The Ford 4.9L/300 I6 is a great engine. However, it is a bit long.

You will need to adapt the Jeep T18 to the Ford bellhousing. IIRC, this involves drilling one hole, as the Jeep version has a slightly different bolt pattern than the Ford 'butterfly'. But here's an idea:

Sell the Jeep T18, and buy either a Ford T18 (2wd) or a Ford NP435 (2 or 4wd). Purchase the adapter from Advance or Novak, and be 100% Blue Oval from the fan back to the Tcase:

"In the end...It's all Hack."
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post #5 of 7 Old 05-04-2009, 06:30 PM Thread Starter
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1979 CJ7 
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We have a 300 straight 6 with a 2wd 4 sp tranny out of a 3/4 ton truck. We want the 4 sp Jeep tranny to bolt up to the Ford bellhousing and clutch assembly. Will this work? Or will there be any probs with the input shaft? I understand that I may have to move the motor mounts. Will this fit?
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post #6 of 7 Old 05-04-2009, 06:39 PM
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If I were you, I would sell the jeep T18, and use that money to buy the Ford T18 adapter kit. You can fit the 300, it's really tight, and may involve moving the radiator forward some but it is possible. If you use the jeep trans you will have issues with the mounting pattern and the input shaft.

1977 Cj5, 258, T-18, 2.46:1 Dana 20, 2.5" BDS lift, OBA, 38.5's. Chevy 60 frt, 14b Rear, Full hydro, 102"wb, full DOM cage.
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post #7 of 7 Old 05-05-2009, 09:44 AM
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Originally Posted by alisa65 View Post
Will this work? Or will there be any probs with the input shaft?
No it won't just bolt up. Even the shortest version of the CJ T18 has a longer input shaft than a Ford version. It's only about 1/2" too long, but still too long nonetheless. Advance and Novak both sell an adapter plate that will bolt between the bellhousing and transmission.

That 300 six is a fair bit longer than your 258 also I believe. It might be a very tight fit.
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