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200-4r, 3.07 rear, 350 carbed
#1214894 Thu Apr 27 2017 01:14 AM
Joined: May 2001
Posts: 8,386
Cletis Offline OP
Extreme Gabster
I have a rebuilt 200-4r from a project I gave up on. I'm considering putting it in my '56. Do you think my rear end is too high geared for such an application?


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1214902 Thu Apr 27 2017 01:37 AM
Joined: Feb 2004
Posts: 20,373
H
Boltergeist
Yes


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1214907 Thu Apr 27 2017 01:57 AM
Joined: Jun 2016
Posts: 248
4
DLBrooks
I take you are talking about when it goes into OD which is D. Is your car a highway driver (lower rpm torque) or high performance? You can use a formula to see rpms at a certain speed.

https://www.ringpinion.com/calculators/Calc_RPM.aspx

1:1 in 3rd gear - normally will not go into lockup

I think .7 in OD.

If you have lockup it will reduce about 200 rpm more at cruising speed - no acceleration.

If you do not want OD put shifter in 3rd. 1 to 1

Trans will run coolest in Lockup, but trans heat may not be a problem, with a trans cooler and how you drive the 56.

Last edited by 42465967; Thu Apr 27 2017 02:02 AM.
Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1214959 Thu Apr 27 2017 03:26 PM
Joined: Jun 2004
Posts: 8,192
W
Master Gabster
I had a 3:08 rear end with a 700 R4 trans in my 70 stepside. with a basic 350 Goodwrench engine. It was a pleasure to drive. It would pull long hills on the interstate in o-drive w/AC on with no problem. If I did have a long hard pull with a load I could lock it in direct drive & still run as fast as I wanted.
I kick myself every day for selling that truck.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1215044 Fri Apr 28 2017 12:51 AM
Joined: May 2001
Posts: 8,386
Cletis Offline OP
Extreme Gabster
It is a highway cruiser with a stock Goodwrench engine. Using the calculator above I would be at 1900 rpm at 70 mph. But that is for a .70 OD and the 200-4r is a .67 OD. George, do you remember what size tires you were running? Mine are 225/60R16.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1215075 Fri Apr 28 2017 03:17 AM
Joined: Jun 2004
Posts: 8,192
W
Master Gabster
Originally Posted by cletis
It is a highway cruiser with a stock Goodwrench engine. Using the calculator above I would be at 1900 rpm at 70 mph. But that is for a .70 OD and the 200-4r is a .67 OD. George, do you remember what size tires you were running? Mine are 225/60R16.

Yes. They were 235/75/15. They measured just shy of 29 in.
George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1215106 Fri Apr 28 2017 01:02 PM
Joined: May 2001
Posts: 8,386
Cletis Offline OP
Extreme Gabster
Thanks. Mine measure just over 26". I think I'd be right on the borderline.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1215143 Fri Apr 28 2017 07:31 PM
Joined: Jun 2016
Posts: 248
4
DLBrooks
Use an on/off switch for the lockup and you may be happy with it.

Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1215213 Sat Apr 29 2017 05:15 AM
Joined: Mar 2010
Posts: 9,232
5
Master Gabster
3.07 rear, .67 OD, 26" tires, 70 MPH.
=1,861 RPM.
At 100 MPH, you would be at 2,658 RPM.

Re: 200-4r, 3.07 rear, 350 carbed
Cletis #1215215 Sat Apr 29 2017 05:26 AM
Joined: May 2001
Posts: 8,386
Cletis Offline OP
Extreme Gabster
Yeah, it is a little too high geared for it. I have an appointment to get the leak fixed on the TH400 Monday.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
My TRUCKS website
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