Help me choose an automatic transmission - JeepForum.com
 
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post #1 of 9 Old 04-17-2016, 07:31 PM Thread Starter
jcal73
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Question Help me choose an automatic transmission

Like the title says.
I have a SBC that we will be installing into our CJ7.
I'm thinking I want to change over to an auto.
I have a T177/dana 300 adapted to the SBC now.
I will be keeping the 300 and adapting it to the auto.
My choices are

1. TH350
2. TH400
3 700R4

What are the pros and cons of each?

Thanks


Jeff

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post #2 of 9 Old 04-17-2016, 10:39 PM
REDnBLUES
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Quote:
Originally Posted by jcal73 View Post
Like the title says.
I have a SBC that we will be installing into our CJ7.
I'm thinking I want to change over to an auto.
I have a T177/dana 300 adapted to the SBC now.
I will be keeping the 300 and adapting it to the auto.
My choices are

1. TH350
2. TH400
3 700R4

What are the pros and cons of each?

Thanks

Which ever you decide on, you will need a Dana 300 adaptor.

1) TH350, strong, low first gear - No OD,
2) TH400, bullet proof - No OD,
3) 400R4/4L60 - strong, low first gear - has OD but is slightly longer than the TH350.

I like autos but personally, I would keep the T177 or upgrade to a decent 5 speed.

1977 CJ7 - LT1/700R4 Project
2015 JKU Rubicon Hard Rock - stock
2013 JK Sahara - gone
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post #3 of 9 Old 04-18-2016, 12:19 AM
ShiJon
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I like the OD if your rig sees regular street duty. You can build one strong and run lower gears.

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post #4 of 9 Old 04-18-2016, 04:28 AM
dg6772
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I have a 700R4 in my CJ 7 and love it. It can be adapted pretty cheap. I used a (used) t350/d300 adapter. Pulled the guts so it's just a spacer and swapped the input to the d300 to accept the output of the 700R4. $250 total + driveshafts, which I didn't have anyway.
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post #5 of 9 Old 04-18-2016, 06:06 AM Thread Starter
jcal73
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Quote:
Originally Posted by dg6772 View Post
I have a 700R4 in my CJ 7 and love it. It can be adapted pretty cheap. I used a (used) t350/d300 adapter. Pulled the guts so it's just a spacer and swapped the input to the d300 to accept the output of the 700R4. $250 total + driveshafts, which I didn't have anyway.
Do you have any front drive shaft clearance issues?

Jeff

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post #6 of 9 Old 04-18-2016, 10:51 AM
Dphillip
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X2 with the 700R4, got mine from the junk yard out of a S-10 Blazer 4X4, used a Novack adapter for my Dana 300 and 17 years later still working flawlessly.

1976 CJ-7, Chevy 4.3 FI V6, 700 R4, Dana 300.
Dana 44 front, Ford 9" rear Currie High Pinion unit
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post #7 of 9 Old 04-19-2016, 02:00 AM
dg6772
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Quote:
Originally Posted by jcal73 View Post

Do you have any front drive shaft clearance issues?
None. I had a shaft made by D&R Driveline in Grand Rapids, Michigan. It is a smaller diameter and thicker sidewall construction. Other than u joints, they're not known for failure......
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post #8 of 9 Old 04-19-2016, 05:34 AM
Dryseals
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700R4, with out a doubt.

Built a street truck for the wife, 85 square body Chevy, she wanted it. And she wanted a 4.10 gear. The truck had a turbo 350 in it and with the 4.10 it was way to wound up at high way speeds. Dropped the 700R4 in it and it was perfect. First gear was a killer and the highway RPM's really settled down.
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post #9 of 9 Old 04-19-2016, 09:56 AM
dg6772
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I should also add that I have a 4" lift and 33" tires. If stock, I'm not sure if clearance will be an issue.
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