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Unread 09-07-2011, 09:38 AM   #1
mopar346
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So what is the strongest trans?

I am going to upgrade the manual trans in my son's Jeep and I want to do it just once and forget about it. I will be upgrading the axles at the same time so that I only deal with the shafts once. Please give your opinion as to the stronger or best and why you feel that way. If possible list any needed parts to make the change from the current set up. I am under the impression that the Dana 300 T-case is pretty much as good as it gets for these but will take input on that as well. Current set up and changes:

360 4V mild HP rating - will never go beyond moderate HP

T-4 absolute junk (IMO) - will stay with a manual

300 Dana - will stay unless told otherwise

I believe 4 inch suspension lift very tight

AMC 20 & Dana 30 2.76s (part of the problem) - be changed probably to Toyotas with 56's unless advised against with logic

35s now will go to 37.5s that I have and probably go to 40s but doubtful over 42s ever

Axle over right now will go to axles under during the change - crossover steering and will cut and reweld housing ends if necessary for proper alignment


Again, I hate doing things twice and this will be a driver/cruiser with moderate to heavy bogging, virtually no climbing. I would say money is no object but it is not a determining factor to the final product.

Thanks in advance, Kevin

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Unread 09-07-2011, 09:48 AM   #2
JeepnBlake
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Your only realistic option if you want to keep that tcase and engine without adapters is the T176 4 speed.

If you're open to adapters there are more options to keep the 360 and the D300.

another decent setup is the T18A with a Dana 20. Low range in the tcase isn't as low, but overall first gear is much lower = lower over all crawl ratio.

Another option is the ax15 or nv3550.

If you're wanting to run all hd stuff, consider the t18 adapted to the d300.
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Unread 09-07-2011, 10:59 AM   #3
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I will assume you are dealing with a CJ-7, but you did not specify.

No doubt in my mind that the NV4500 is the strongest tranny you could swap in that has adapters availible. You would need a conversion bellhousing from Advance Adapters, and a Centerforce clutch. A full kit gives you everything you need. A 1" BL will help with clearance with the tub, but it is not essential (may have to make some room for it at the tranny cover if you don't).

Likely more tranny than you need, and it will push your D300 rearward, so new or re-done driveshafts are part of the problem. It's a tight fit in a 7, and weighs 200#. Oh yea, gonna cost a fortune.

Fits great in my Scramber, however (PO installed -yay).

Not really recommending it, but you asked for "strongest."
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Unread 09-07-2011, 11:20 AM   #4
mopar346
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Yes, it is a CJ7. That is good info, I need to know what some of these were in factory, such as the NV4500 & AX15.

Thanks
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Unread 09-07-2011, 11:21 AM   #5
bkeese
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You bigger problems then the T4. First the T4 was never intended for a V8, so behind a V8 your junk description is correct. Second, a Dana 30 and AMC 20 were not designed for 35s, especially with 2.73s and if you are intertaining 37s - 42s then at least Dana 60s are in your future.

The T176 or T18a may stand up to that power and they are AMC. Otherwise it is adapter time. I like the SM476 especially with a doubler (203&205). Can be found in junk yards. But the toughest trans is the T400, but you want a manual.
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Unread 09-07-2011, 12:00 PM   #6
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Quote:
Originally Posted by bkeese View Post
I like the SM476 especially with a doubler (203&205).
I'm assuming you meant to type SM465.

If a granny low four speed (no overdrive) is wanted, the T18, Dana 20 option is the only adapterless option.

The stock axles need to go given the intended tire size.
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Unread 09-07-2011, 12:20 PM   #7
kw89425
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the old 465 bulldog trans is as close to bullit proof as you will ever find easy to find parts are easy to get and you can get the adapter for the dana 300 or you can go with the 465 205 combo if so look for 80's model you can get the clocking ring for them like the 300. i think i saw on advance adapter web site or some where that you can drill the amc bellhousing to fit the 465.
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Unread 09-07-2011, 02:26 PM   #8
gmakra
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Novack site will give you a good starting point. By the way I disagree with the NV4500 and while it is an great transmission its not with out its downfalls, one its really big and long plus it requires abit of work to adapt its doable but in the end I doubt you will ever get full use out of it.

http://www.novak-adapt.com/knowledge...on_gateway.htm

I would look at the first four 4 speed trans.
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Unread 09-07-2011, 02:40 PM   #9
mopar346
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Keep it coming, what did a 465 come in? I can look on line tonight but I'm technicially working right now so I shouldn't surf.
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Unread 09-07-2011, 02:43 PM   #10
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Unread 09-07-2011, 03:06 PM   #11
kw89425
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if you are going to use the dana 300 all you need to find is one for a 2wd they can be had cheap here
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Unread 09-07-2011, 03:15 PM   #12
mopar346
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Please explain, the output shaft is right? Cut the shaft? Knock off the tail housing? Rebuild with an output from a 4X4?

From what I understand the 300 is strong enough, is that correct? Are yokes available for large u-joints?
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Unread 09-07-2011, 03:36 PM   #13
kw89425
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from what i read you have to change the output shaft on the 465 2wd or 4wd it all comes in the adapter kit for the 465 300 combo it is not a direct fit to the dana 300. you can use the 465 205 chevy combo it will be a little longer than the 465 300 combo. im running the 465 205 on 38.5's and the driveshaft is doable. checkout novaks web site. you need to rethink your axles i dont see the toyata axles taking v8 and big tires i think you would be throwing good money after bad on that. if your going as big as 40's your going to have to spring for heavy axles.
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Unread 09-07-2011, 04:30 PM   #14
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T 18 or a NP465
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Unread 09-07-2011, 04:43 PM   #15
kw89425
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Quote:
Originally Posted by oteps View Post
T 18 or a NP465
the 465 is a muncie trans
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