upgrade from 3spd to 4spd - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-20-1999, 10:30 AM
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upgrade from 3spd to 4spd

I would like to upgrade the 3 spd manual in my 78 CJ5(304), what model 4 spd would be a direct replacement and can I use the same xfer case. If a good direct replacement is not available, please recommended a good after market setup/kit.

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post #2 of (permalink) Old 12-20-1999, 06:33 PM
 
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Re: upgrade from 3spd to 4spd

T18 is the way to go, but pretty hard to find one from another CJ ( the only one that will be short enough) you can find Fords, and FSJ T18s under $400 but it costs a few hundred more to convert them...

the T18 is strong as heck, and the T18a has a first gear of 6.32:1 good granny 1st gear for crawling and such..



ozarkjeep
1977 CJ5 looking for T18a and hardtop!
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post #3 of (permalink) Old 12-21-1999, 06:35 AM
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Re: upgrade from 3spd to 4spd

Hey John,

I am doing this conversion now. I had a junk factory T-150 3speed and i am swapping in a T-18a now. Unfortunately, i was NOT on this BBS when i picked up my T-18a and ended up buying one that need to have a short shaft kit installed. The short shaft kit ($185) and a complete rebuild kit ($150) have both been ordered from Hicks4x4 and the tranny is currently getting a rebuild. The URL i found most usefull in reasearch this was Kirk Beasleys swap. Chck it out at: <url>http://www.off-road.com/jeep/tech/convtrans/cjt18/</url> Depending on what 3 Speed you have in the now you may even be able to use your same bellhousing. Feel free to email me off list at: [email protected]

Good Luck


Kevin Speicher
New England 4x4 Club
http://146.189.121.83/
79 Jeep CJ-7
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post #4 of (permalink) Old 12-21-1999, 06:38 AM
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Re: upgrade from 3spd to 4spd

Sorry Man,

That was http://www.off-road.com/jeep/tech/convtrans/cjt18/

Enjoy

Kevin Speicher
New England 4x4 Club
http://146.189.121.83/
79 Jeep CJ-7
post #5 of (permalink) Old 12-21-1999, 07:07 AM
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Re: upgrade from 3spd to 4spd

This site might halp as well...

http://fp.enter.net/~jeepfan/t18_swap.htm

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post #6 of (permalink) Old 12-21-1999, 10:04 AM
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Re: upgrade from 3spd to 4spd

Here's the same site as a link:
http://fp.enter.net/~jeepfan/t18_swap.htm Also check out http://www.jeeptech.com. Terry Howe has lots of info on transmissions there as well as a Ford T18 conversion to work in a CJ.

post #7 of (permalink) Old 12-24-1999, 09:49 AM
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Re: upgrade from 3spd to 4spd

I got lucky and was able to purchase a NP435 out of a 3/4 ton Ford PU for $50.00. The bolt pattern will fit the Jeep bellhousing but a kit is needed for adaptation to the t-case. I've run NP435's since the mid-70's and never had a problem. I couldn't find a T-18. The 435 has a nice granny low first gear. Good luck!

post #8 of (permalink) Old 12-24-1999, 09:59 AM
 
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Re: upgrade from 3spd to 4spd

generally the NP435 is abit long for a stock CJ5 after you ad on the adapter to a transfercase ( isnt it like 5-8 inches), I wanted to go this route too !!

It seemed cheaper, until I figured in the rear adapter, and the missing length..

You can find T18as, short and ready for a CJ, for under $600, you just have to look..



ozarkjeep
1977 CJ5 looking for a Hard top near NW Arkansas!
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post #9 of (permalink) Old 12-25-1999, 11:27 AM
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Re: upgrade from 3spd to 4spd

ozarkjeep is probably correct, NP435 with adapter may be too looooong.

post #10 of (permalink) Old 01-01-2000, 10:47 PM
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Re: upgrade from 3spd to 4spd

I was paging through the Jeep Owners Bible by Moses Ludel tonite. On page 307 he does have a photo of a NP435 conversion in a 1981 CJ5, so maybe it would be an option to consider.

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