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Old 09-25-2013, 09:37 AM
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Transmission/Rear in 72 Chevelle

Hi everyone I'm new to the forum!

I am picking up a 1972 Chevelle for a steal! It has a th350 with 4.11 behind it. Would dropping in a 700r4 drop the RPMs low enough for some highway cruising if i had to? I dont see myself on the highway that much in it. I know a couple other factors come into play also.

Thanks

Bobby

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Old 09-25-2013, 01:46 PM
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Yes, a 700 would make it easier to drive on the highway, but the 3.06 first gear in that transmission is going to be completely wasted with the 4.11 gears. A 200 4R would be a better choice. The 200 will also fit in the space that the TH350 is in now, so the cross member won't have to be modified and the drive shaft length will stay the same.
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Old 09-25-2013, 03:25 PM
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I agree with Big Gear Head. The 2004R is dimensionally the same as the th350. Your current trans cross member just needs to be moved back 4 inches or so and no driveshaft modifications are necessary. The 2004R is lighter that the 700R4 and the 2004R can be built to easily handle 500+ horse power. I put one in my 65 Chevelle 2 years ago and could not be happier. The biggest problem on my install was modifying the parking brake cable system as it attaches to the trans cross member.
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Old 09-25-2013, 09:03 PM
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Quote:
Originally Posted by 72Muscle View Post
Hi everyone I'm new to the forum!

I am picking up a 1972 Chevelle for a steal! It has a th350 with 4.11 behind it. Would dropping in a 700r4 drop the RPMs low enough for some highway cruising if i had to? I dont see myself on the highway that much in it. I know a couple other factors come into play also.

Thanks

Bobby
Do the math.

OD in the 700R4 is 0.70:1, which drops your effective gear ratio to 4.11 x 0.70.
(Hint: that's about 2.88:1).

I do agree that a properly built 200-4R is the better choice for a lot of reasons. Gear ratios is one. Ease of fitment is the other. Your current driveshaft works with the 200-4R.
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Old 09-26-2013, 08:04 AM
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Thanks guys for the replys, Helps me understand things better. I did hear an adjustment needs to be made to the parking brake cable... Can you guys think of anything else I'll need to look out for?

This is what I'm picking up for $10K including a top cat hauler
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Old 09-26-2013, 08:52 AM
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Nice car! The 200-4r is a bit of a niche market transmission. A performance 200-4r should really be built by a specialist, not a wholesaler like you find in jegs or summit.
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Old 09-26-2013, 01:46 PM
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I haven't seen a set of those old slapper bars on a Chevelle in a long time. I wonder if anybody still makes them.
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Old 09-26-2013, 01:54 PM
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are those the Lakewood 20475 or Jegs equivalent. They're like $70 a set and 28" long.
There are some much better designs these days but a properly set up car runs great with them
http://www.jegs.com/webapp/wcs/store...=traction+bars
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Old 10-09-2013, 07:28 PM
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I know this is a late post, but just saw it. You'll like the 200 4r. I rebuilt one for my 77 nova. Didn't have to change drive shaft. Moved cross member back and drilled two new holes, one on each side because two holes were already there. It wasn't hard to rebuild. Local tranny guys didn't want to rebuild it my way, they were just wanting to do the stock rebuild. I added extra clutches, bigger valves, larger relieved pump and ect. If you have 4.11, with the 2.74 low gear, it will be a real runner. I am still playing with mine and always will. You will have to do a lot of work with the speedogears to get that to read correctly. So when your doing that, you can play with the weights on the governor to get your shift points up were you want them. That is why you should put a drain plug in the pan because you'll have to drop the pan several times to get it right. YWLI.
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Old 10-12-2013, 08:00 PM
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Quote:
Originally Posted by 72Muscle View Post
Hi everyone I'm new to the forum!

I am picking up a 1972 Chevelle for a steal! It has a th350 with 4.11 behind it. Would dropping in a 700r4 drop the RPMs low enough for some highway cruising if i had to? I dont see myself on the highway that much in it. I know a couple other factors come into play also.

Thanks

Bobby
Just my opinion but i`d leave it the way it is if your not planning on doing any , or very little highway / freeway play . Drive it for a while , have some fun, then see if you want to pursue changes .
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