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Unread 07-16-2010, 07:10 PM   #1
drummerchukb1
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1998 TJ Wrangler 
 
Join Date: May 2009
Location: charlotte
Posts: 269
J-10 project questions

Im looking at starting a J-10 project. other than rust, should i look out for anything when buying the truck? is there an optimum setup?

does anyone have power numbers (hp and tq) for the v8 vs. the v6. are iether engine worth keeping or rebuilding, or should i find a newer v8 (or 6 cyl) drive train to swap (for power and mpg)?

It is a jeep so i know the mpg will suck, but does anyone have a range?

are there parts out there, or will everything be a fab job?

this seems like it would be a good project. I have a TJ now, but this seems like a whole new ball game. i might have more questions, i appreciate the help!

thanks, Charlie

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Unread 07-17-2010, 09:09 AM   #2
Eric1080
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1978 J-Series Truck 
 
Join Date: Aug 2008
Location: Dillon, CO, Colorado
Posts: 650
obviously a 258 will be better on gas but i sure love my warmed 401. i get 10 in town and 12-13 highway with th400 (no overdrive) 35 mts and 4.10 gearing. not bad mpg considering. my truck came from colorado and had almost no rust. floorboards will be rusty wherever. the only thing i would (will) change is adding fuel injection. i think the 74+ trucks have tons more parts. bjsoffroad.com. also, the 80+ tcases might not be able to handle brutal v8 power.
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Unread 07-17-2010, 10:52 AM   #3
drummerchukb1
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Join Date: May 2009
Location: charlotte
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Quote:
Originally Posted by Eric1080 View Post
obviously a 258 will be better on gas but i sure love my warmed 401. i get 10 in town and 12-13 highway with th400 (no overdrive) 35 mts and 4.10 gearing. not bad mpg considering. my truck came from colorado and had almost no rust. floorboards will be rusty wherever. the only thing i would (will) change is adding fuel injection. i think the 74+ trucks have tons more parts. bjsoffroad.com. also, the 80+ tcases might not be able to handle brutal v8 power.
so are there three engine options. the 258, 360, and 401? are the tranny and t case the same for both V8s?

are 4.10 stock gearing? i beleive i read in the axle section they have d44 front and rear, so they have a large gear range, all the way to 5.13, right?
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Unread 07-17-2010, 06:03 PM   #4
Eric1080
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1978 J-Series Truck 
 
Join Date: Aug 2008
Location: Dillon, CO, Colorado
Posts: 650
4.10 for manual tranny i believe. the th400 was up til 79 with bw qt. after that im think its the tf727 with new process t cases. the 360 could be had with 2 or 4 barrel carb. j20 has hd 44 and dana 60 rear. i love my truck. ive had 3 xjs, 3 zjs (2 of which were 5.9), and other non jeeps. i personally LOVE the J truck. people are always honking and looking at it. i will never sell it
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Unread 07-17-2010, 10:29 PM   #5
drummerchukb1
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1998 TJ Wrangler 
 
Join Date: May 2009
Location: charlotte
Posts: 269
thanks!

International Full Size Jeep Association

looks like i answered my own question about power. so i know the power of the engines, i know the axles and ratios of different j-10 trucks, i know potential milage. now the question is, if i do a J-10 project, would it be worth my time to swap the engine?

the power numbers on these engines arnt great, as expected for 70's technology, and they arnt efficient, also expected. if i got my hands on a newer v8 drive train, or even a good 6cyl drivetrain, would a swap be the best option, or are the stock v8s better than they seem?
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Unread 07-18-2010, 06:18 AM   #6
Eric1080
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1978 J-Series Truck 
 
Join Date: Aug 2008
Location: Dillon, CO, Colorado
Posts: 650
better than they seem, imo. if i was to buy another one with bad engine or no drivetrain i would swap in a cummins.
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gas mileage , power , project

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