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Re: 200-4r, 3.07 rear, 350 carbed [Re: Cletis] #1215317 Sun Apr 30 2017 04:39 AM
Joined: Mar 2010
Posts: 8,624
5
52Carl Offline
Master Gabster
I recently finished putting together a '49 3100 with a TH400 with and 3.08 rear end and 30" tires. 2,415 RPM at 70 MPH. It performs very nicely.
With your 26" tires you would be doing 2,786 RPM at 70 MPH.

Re: 200-4r, 3.07 rear, 350 carbed [Re: Cletis] #1215367 Sun Apr 30 2017 04:21 PM
Joined: May 2001
Posts: 8,386
Cletis Offline OP
Extreme Gabster
Yes. it is spinning pretty good at 70-75. That is why I was considering the OD.


"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.
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Re: 200-4r, 3.07 rear, 350 carbed [Re: Cletis] #1215381 Sun Apr 30 2017 06:01 PM
Joined: Jan 2008
Posts: 4,658
C
crenwelge Offline
Shop Shark
I think you will be better off staying with the Th400. They are tough. They stood up to motors as big as the 500 Cadillac. And 2800 used to be considered a fast idle. It won't hurt it a bit and it really won't use much more gas. I'm afraid an OD would constantly be shifting back and forth.

Re: 200-4r, 3.07 rear, 350 carbed [Re: Cletis] #1215463 Mon May 01 2017 03:28 AM
Joined: Mar 2010
Posts: 8,624
5
52Carl Offline
Master Gabster
Going with taller tires will get you right where you want to be at 70 MPH. You won't be doing any burnouts or pulling stumps, but your highway cruising will be stress-free.

Re: 200-4r, 3.07 rear, 350 carbed [Re: Cletis] #1215557 Mon May 01 2017 05:22 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
Another option would be a trans that was used pretty frequently ahead of a 3.08 rear axle, the TH 350C. It has a locking clutch in the torque converter that gives approximately a 10% RPM reduction at light throttle cruise by eliminating the built-in slippage in the converter. That one uses a 3-switch series of controls, a vacuum switch that senses engine load, a brake switch that disengages converter lockup anytime the brake is used, and a governor pressure switch in the valve body that sets the minimum lockup speed. All three switches must be closed to send power to the solenoid valve that locks in the converter clutch, but no computer is needed for the system to function.

BTW, converter locking clutches are nothing new- - - -the 1949 Studebaker automatic had one, and also the 55-57 Packard Ultramatic. No electrical controls were used on either one of them, however.
Jerry



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 [Re: Cletis] #1215581 Mon May 01 2017 07:17 PM
Joined: Jun 2016
Posts: 233
4
42465967 Offline
DLBrooks
But the kick is he has a good 200r4 in hand for a sbc. From what he said a stock 350 crate which should have good low end. Especially with a 3600 lb truck. Just to have the option of OD at 45/up if in D is compelling. The option of driving in 1 to 1, OD with no lockup, and OD with lockup is compelling. Driveshaft should fit.


Maybe he has a better plan for the 200r4.

Last edited by 42465967; Mon May 01 2017 07:20 PM.
Re: 200-4r, 3.07 rear, 350 carbed [Re: Cletis] #1215582 Mon May 01 2017 07:29 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
A boat anchor is a better plan for the 2004R. Maybe he can sell or trade it to someone who doesn't know any better.
Jerry


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 [Re: Cletis] #1215629 Tue May 02 2017 12:15 AM
Joined: Jun 2006
Posts: 744
T
tomctomc Offline
Shop Shark
i put a 700R4 behind a goodwrench 350 driving a 3.08 posi in my 75 Camaro. that car is right around 3600 lbs. its a good set-up, but my tires are only 24" so its geared a bit lower than the truck would be. the 200R4 is weaker but it suggests the ratios would be OK with the V8. i really like the OD/lockup.

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