LS1 Engine. Need Transmission Choices: T5 vs T18 vs ? - Page 2 - JeepForum.com

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post #16 of 25 Old 06-09-2011, 03:04 PM Thread Starter
tlannom
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It looks like I'm heading down the SM465 path which has caused more questions.
  1. It looks like there a three versions of the SM465. Will any of them work or is there a particular year that works better?
  2. I've seen several for sale with the NP205. It looks like the NP205 doesn't have the ideal gearing compared to the Dana 300. Was hoping to skip on the SM465 adapter but that doesn't seem like a good idea. Agree?
  3. Anything else I should be aware of when looking and purchasing a SM465?

Thanks.


'86 CJ7 Laredo, LS1 Corvette engine, AX15 transmission, Dana 300 4:1 twin-sticked, RE 4 1/2" lift, YJ cage, Bzerk front/ rear bumpers
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post #17 of 25 Old 06-09-2011, 04:02 PM
sjcj7
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I have a sm465 out of a blazer with a dana 20
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post #18 of 25 Old 06-09-2011, 08:26 PM
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Quote:
Originally Posted by kickingprop View Post
I see what you did there.

To the OP good choice on the 465, 205s are strong tcases, the 2:1 isn't the best, you could however put in a lower gear set 3:1 ratio. That would be better than the 2.61 the D300 has, or you could get the adapter for the 465 to 300. Neither of which are cheap.

The first gear in that 465 with the 205 in low is fairly low compared to anything else that was bolted to the D300 from the factory.

Crunch the numbers between the different options:

http://www.grimmjeeper.com/gears.html
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post #19 of 25 Old 06-11-2011, 07:26 AM Thread Starter
tlannom
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UPDATE: I may end up going down the T18 path after all. After crunching some numbers between the T18 and SM465 it really seems to come down to availability and price. Below are the options I considered. When you include adapters, bell housings, and the price of the transmission, the prices seemed to be within $200-300 of one another.
  • T18/ Dana 300- crawl ratio: 72.25. I found one that is rebuilt and at a decent price. This seems to be a good alternative.
  • SM465/ Dana 300- crawl ratio: 64.68. Have not found a rebuilt SM465 with Dana 300 output. Good alternative if I find one in my area.
  • T18/ Dana 20- crawl ratio: 56.2. Really want to stick with my Dana 300
  • SM465/ NP205- crawl ratio: concerned that with my gears (3.54) and the stock Dana 300 this ratio may be too low.

I will keep you posted.

'86 CJ7 Laredo, LS1 Corvette engine, AX15 transmission, Dana 300 4:1 twin-sticked, RE 4 1/2" lift, YJ cage, Bzerk front/ rear bumpers
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post #20 of 25 Old 06-13-2011, 08:28 AM
CSP
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Don't forget that the T18 is going to require some adapters to bolt to the engine. The SM465 uses a factory GM bellhousing.
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post #21 of 25 Old 06-13-2011, 09:44 AM
LT1CJ7
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Just be done with it. Shell out the $$$ for the NV4500 & Atlas !
Or the 4L60E/4L80E for the auto
Never a worry again on breakage!
The 205 is a strong case, But it's huge, And as said above the low sucks!
Hope you don't do any kind of speed shifting behind that LS1,
The T18 & SM465 are no speedy shifting transmissions.
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post #22 of 25 Old 07-14-2013, 11:51 AM
WaterBoy303
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What about AX15? I'm about to do an LS Swap in my 84 cj7 and plan on using the AX15. Not the strongest but will hold up to 350 HP+-. Any input?
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post #23 of 25 Old 07-14-2013, 09:20 PM
1986cj
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If you go with the T18 go with a Ford T18, If you can get access to a lathe to turn down the bearing retainer, The Ford is very easy and cheep to mate to a GM bellhousing and the transferrcase adaptor will come with the right mainshaft.
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post #24 of 25 Old 07-14-2013, 09:42 PM
Skerr
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How do you drive your Jeep? Do you like to run through the gears and use the power? Although I like the T18, and I have one in the 5, it is not a fast-shifting tranny. Neither is either of the SMs. They're GREAT trannies, but they are truck trannies. That may not be a concern... just throwing it out there. Check out Novak's site and see what they say about all the choices, then choose what you like.

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post #25 of 25 Old 07-29-2013, 01:27 PM
PROJECT 23
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Quote:
Originally Posted by WaterBoy303 View Post
What about AX15? I'm about to do an LS Swap in my 84 cj7 and plan on using the AX15. Not the strongest but will hold up to 350 HP+-. Any input?
I would personally use the money that you ripped me off for to get something a bit more stout for the LS. The $900 that you took me for is a fairly good jump on a used NV4500.

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