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Thread: 350 swap into TJ

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    That Guy afjeep's Avatar
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    Default 350 swap into TJ

    i'm curious as to advantages aside from the obvious power and disadvantages aside from decreased gas mileage. i'm thinking about doing a 700R4 swap at the same time. what kind of troubles am i looking at here? anyone ever done this? suggestions, pros, cons? thanks for your help.

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    Administrator korisu56's Avatar
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    Wildman I think has a 350 in his TJ.

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    Administrator/Jarhead Jeeper USMCHarleyJeepGuy's Avatar
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    The people I have known to put a late model small block in their rigs had an INCREASE in mileage, not a decrease. The small block doesn't have to work as hard to roll an aerodynamic brick as the 6 does.
    Marines...shoot me a PM if you have not received an invitation to the Jarhead Jeepers social group on this site and would like to be a member.

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    Land Squid Jeffb_79's Avatar
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    I would think the downside would be you would have to replace your entire drivetrain to go with the new engine. Don't know how long stock axles would hold to the new power.

  5. #5
    Member JimhatTJ's Avatar
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    6.0L SBC here and milage went up almost double over the I6
    03 Rubicon, 6.0L Chevy, 700R4, 241, ORI struts, custom F&R dual traiangulated longarms, 39.5 Irok, frame backhalf, 35 Spline Ford 60's, Full Hydro steering, 110"wb
    05 TJ (salvage), 6.0L aluminum head Chevy with LS1 parts (@400hp) , 4L60E, home made longarm on 14" SAW coilovers, 35 spline Dana 60's, 100"wb

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    Junior Member andy02's Avatar
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    A SBC weighs in at about the same as the I6. It is also inherently a slightly more fuel efficient engine than an inline engine will ever be. Add that to the fact that it doesn't have to work as hard and you have a pretty fuel efficient vehicle. I do not know why Jeep didn't drop in a V8 in the TJ from the bigginning.

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    That Guy afjeep's Avatar
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    thanks for all of y'all's replies. thats interesting about the mileage but i guess it makes sense. i am planning on replacing my tranny at the same time anyway and eventually putting a 44 in the rear. would i have to swap transfer cases too?

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    Member JimhatTJ's Avatar
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    Advance Adapters makes an adapter that will mate your tcase to the 700r4
    03 Rubicon, 6.0L Chevy, 700R4, 241, ORI struts, custom F&R dual traiangulated longarms, 39.5 Irok, frame backhalf, 35 Spline Ford 60's, Full Hydro steering, 110"wb
    05 TJ (salvage), 6.0L aluminum head Chevy with LS1 parts (@400hp) , 4L60E, home made longarm on 14" SAW coilovers, 35 spline Dana 60's, 100"wb

  9. #9
    faster mabricator
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    Why use a 350??? Already have one? Junkyards are full of 5.3/auto combo's that will probably bolt to your t-case. More hp, better mpgs, better injection. Either way, have fun, and that d35 is going to HATE you!!!

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    That Guy afjeep's Avatar
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    Quote Originally Posted by russellmn View Post
    Why use a 350??? Already have one? Junkyards are full of 5.3/auto combo's that will probably bolt to your t-case. More hp, better mpgs, better injection. Either way, have fun, and that d35 is going to HATE you!!!

    hmm, do you have any more info on that engine, im not familiar with it. whats it out of? thanks for the suggestion.

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