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Old 06-14-2014, 02:03 AM   #1
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Ford 351 Windsor in a 93 YJ

Hi guys I'm finally doing it. I'm swapping out my 4.0 for a 6.6 Small Block Ford! It's a 351W bored n stroked to a 408W. I wanted to keep things simple so it's old school carb. It's still gonna make pretty decent power I believe. More so, I hope! I need some advice. Can I use my NP231 T-Case and I'm thinking of using a C6 tranny but I hear that it's too long n too heavy. Any alternatives? I want an auto trans. I'm putting a trans brake in it. I'm planning to use this jeep mostly for sand drags and sand dunes, once in a while driving around town n occasional rock crawling. What tranny should I use? And I have two sets of D44 front and back axels I'm not sure if to use the 3.73 or 4.11 one set is going in my YJ n one set is going on Craigslist. Which is better and why? Hope u guys follow where I'm going. N hope it makes sense. Lol so what tranny? What TCase n what axel/ gear combo? Thanks in advance.

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Old 06-15-2014, 02:56 AM   #2
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Cant really give advice on the trans as I'm a chevy person but can give advice on gears... You should decide what you want to do with it, tires size transmission ratios and transfer case ratios all play a role in the decision. Use a final drive calculator on the internet and put in the figures for each component and it will give you detailed info on what rpm you'll be turning at what speed. Which for drag racing can play a big part. Knowing where your motor will make the most power will help in that decision. But to be simple, go 4.11. out of the two for what you say you want to do thats the one I would choose.

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Old 06-15-2014, 12:46 PM   #3
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The C6 will definitely be too heavy and large, I think a C-4 or Glide will work better. I'm looking into doing a ford small block myself but doing a 302 stroked to 347. Good luck with build and keep us posted on progress.
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Old 06-15-2014, 02:15 PM   #4
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There are adapters out there to put a Chevy transmission behind a small block ford any one of the chevy transmissions are a good choice , if a powerglide will bolt up so will a th350 , th400 , 700r4 etc. Use a GM transfer case with a drivers side drop you will be good to go.
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Old 06-16-2014, 01:47 PM   #5
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Umm, all ford 4x4 trannys are about the same length. My current jeep is a 408 with a NP435 4 speed and my previous was a 347 and C6. I would chuck the NP231 case as well for a NP205.
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Old 06-16-2014, 06:30 PM   #6
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Quote:
Originally Posted by Ibuildembig View Post
Umm, all ford 4x4 trannys are about the same length. My current jeep is a 408 with a NP435 4 speed and my previous was a 347 and C6. I would chuck the NP231 case as well for a NP205.
Length yes but C6 is a bulky heavy tranny. Not saying anything negative about them but I would think there are others out there that would be a little less cumbersome to work. I am a Mustang drag race guy so not that familiar with the mounting of the ford parts in a jeep. I've only had stock motors in all my jeeps. Good to know they all would work though. Thanks for info.
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Old 06-16-2014, 07:52 PM   #7
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Problem is the only 4x4 c4 that I know of is in a eb, they are high. I wouldn't spend the money for less strength and to save 40 pounds.
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Old 06-16-2014, 10:47 PM   #8
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listen to this guy^^^ he knows his stuff when it comes to the ford powered swaps.

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