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Unread 06-30-2002, 11:42 AM   #1
GregM
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Chevy smallblock and 700R4 for a 91 YJ....any thoughts.

I just bought a Chevy 305 with a 700R4 automatic for my jeep. The engine is the carb. version. I know I will need new motor mounts, the transfercase adapter, and a bigger radiator, but what else will I need to do the swap? This is my first post on here.

GregM

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Unread 06-30-2002, 08:23 PM   #2
Jeepfreak81
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by GregM:
<strong>I just bought a Chevy 305 with a 700R4 automatic for my jeep. The engine is the carb. version. I know I will need new motor mounts, the transfercase adapter, and a bigger radiator, but what else will I need to do the swap? This is my first post on here.

GregM</strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">My first post on here was of the very same question.... i still have yet to get a straight answer... if your trying what i think your trying your doing the same as me... straight up engine/tranny swap without altering the suspension -- or as little as possible. I have a stock 4 banger 94 yj, from what i have been told minimum is rad, floorshift coversion kit, motor mounts, you'll have to make a new transmission mount, possibility of driveshafts as well. i have been also told and i sorta knew that the front springs may not be able to handle the extra weight, i am considering a 2" lift, not sure if it will be add-a-leaf or not... wish i could help more but i have been researching for a year now and this is what i have gotten, my next step is to call cascade four wheel drive in grand rapids michigan... there is a man there that has done the same conversion and i am going to have him price me out what i need in his spare time if he will, if you find any information before this PLEASE email me some if you can... jmeganck@hotmail.com i hope this helps... but i know it doesnt tell you much <img border="0" title="" alt="[Frown]" src="frown.gif" />
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Unread 07-02-2002, 02:40 AM   #3
jeep_fun
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O, I'm doing the 350 conv. next summer and heres what i have gathered. Youll need a new radiator, motor mounts, new TCase(maybe, this is sorta up in the air but id say find a Dana 300 and flip it w/ tri-county gear), CV Dshafts are good to have too, get a new rear axle at least cause the Dana 35 wont hold ***** over the I6 and dont listen to the guys that have kept them. If they havent broke the axle yet then they dont wheel at all. At least put a ford 9" in or try to find a 44 out of a TJ with but these are extremely hard to fing(most TJs have 35 in the rear). Well i hope this helps. Anymore Q's email me at Jeep_fun@hotmail.com
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Unread 07-02-2002, 12:42 PM   #4
NaeKid
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Check my <a href="http://members.shaw.ca/snowjeep/modifications/halfton.htm" target="_blank">writeup</a> about the 350 swap I did in my Jeep. If you have any questions about it, let me know, and I will be happy to answer whatever questions you have.
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  • From street to trail, '88 YJ on 38" tires does it all well
  • Silver 2006 TJ Unlimited, zombie ready as the daily-driver
  • a Kawasaki KLR650 DualSport bike

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Unread 07-04-2002, 11:16 PM   #5
GregM
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NAEKID, I had already scoured your site before you posted, tons of good information. I have been eyeballing a couple of early 80's late 70's chevy 4x4's for axles, but haven't decided if I wanna try that yet. How much fabrication is involved in putting the chevy truck axles in a jeep? Antything about the chevy engine/tranny going to give me a lot of trouble fitment wise?

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Unread 07-05-2002, 07:04 AM   #6
NaeKid
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All that it took to hook my axles in was to cut the spring perches off the rear axle and move them inwards by approximate 1/4" each and then I turned my pinion to face my already installed T-Case.

The front axle is a little more difficult in that there is only one spring perch that can be moved inboard by the 1/4", and I had to use a die-grinder to oval out the center section's spring mount to allow the "stock" Jeep springs to slide over enough to have it almost centered. Its out by about 1/8" .. so its not that bad.

Make sure that you have a welder handy as the way that I did it, welding is highly required. I would highly recommend purchasing a whole truck that runs well, but looks horrible to save yourself a whackload of money. There are always little parts that you need, but won't be able to easily (or cheaply) get from a wrecker or parts store. Once the rig is stripped, and your Jeep is "running", then call up a flat-deck tow-truck to haul the rest to the nearest crusher/wrecker.
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Hello, my name is Vance and I am a Jeepaholic.
Its better to be naked with your friends, than to be clothed with your enemies
  • From street to trail, '88 YJ on 38" tires does it all well
  • Silver 2006 TJ Unlimited, zombie ready as the daily-driver
  • a Kawasaki KLR650 DualSport bike

- - - - - - -TEOTWAWKI- - - - - - -


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Unread 07-05-2002, 08:50 AM   #7
NaeKid
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Opps .. missed the part about fiting the engine / tranny combo ..

The factory Chevy motor mounts are used and welded into place at almost the exact same spot that the factory Jeep motor mounts were (for my I6). Look at the pic of my motor mount, you will find it about 1" from a frame hole. I could have moved the motor forward another inch or two as I had to use a huge fan spacer just to get the fan close enough to the radiator, and I could have used a longer rear driveshaft. As far as balance goes, I have the engine back far enough that there isn't way too much weight on the front axle vs weight on the rear axle.

I used the factory Chevy T-Case cross-member and made some brakets to hold it in place. As I don't have a body-lift (and don't want one), I tucked my tranny as high as I could without touching the body.

As far as the engine and such fitting, it almost looks like the Jeep was designed with Chevy parts in mind
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Hello, my name is Vance and I am a Jeepaholic.
Its better to be naked with your friends, than to be clothed with your enemies
  • From street to trail, '88 YJ on 38" tires does it all well
  • Silver 2006 TJ Unlimited, zombie ready as the daily-driver
  • a Kawasaki KLR650 DualSport bike

- - - - - - -TEOTWAWKI- - - - - - -


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Unread 08-11-2013, 07:25 PM   #8
mturner0111
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how does the 700r4 hold up in a jeep? and if you guys had built engines did you run a stall converter?
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Unread 08-11-2013, 07:31 PM   #9
dillonjm
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..Of oldest thread ressurection. Well done.

Sorry, I'm actually impressed.
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Unread 08-11-2013, 07:44 PM   #10
mturner0111
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lol never noticed the dates!
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