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BuickPower.Com
Performance Tech Articles
(Just My Opinion, There's Still Time To Be Wrong!!!)
The 200-4R
Vs. The 700-R4
I Read That Replacing The
200-4R Transmission With A 700-R4 Is A Bad Move. I Don't See Where
The Bad Move Is. The 200-4R Transmission Is One Of The Worst
Tranny's GM Has Produced. The Clutch Paks Wear Out Too Quickly,
And If You Want To Lock Up Your Torque Converter (Extra 3 Tenths In The
1/4 Mile) Then Be Prepared To Replace Parts In The 200-4R. The
Heat Generated By The Lock-Up Causes Numerous Problems. I've Found
This From Experience, And From Fellow Buick Technicians. The
Reason Given Not To Replace It With The More Reliable 700-R4? It
Weighs More, The Overdrive Is Deeper In The 200-4R, And They Only Come
In Chevy Bolt Patterns. All Of These Are True. Lets Compare
Though. The 200-4R Weighs 27 Pounds Less Than The 700-R4 (Maximum)
Or 10 Pounds More (Minimum). Go Buy A Fiberglass Bumper If Your
Worried About The 27 Pounds. The Overdrive Is Deeper, No Argument
There, If You're Worried About Gas Mileage, Then Why Are You Racing The Car.
The Gearing Is Better For Heavy Cars. People Change Out There Rearend
Gears All The Time, To Leave The Line Harder. The Bolt Patterns Do Only Come In Chevy Form. Jegs
Sells An Adapter Plate (Part #890-230001), It's 52 Bucks. Pay
That, Or Hold On To It, You'll Need It To Rebuild That 200-4R
Again. Everyone I Work With Questions Buick's Decision To Put The
200-4R In The Buick GN Torque Monsters. For A Daily Driven Weekend
Racer, The 700-R4 Looks To Be A Winner.
My 700-R4 Is In. The Process
And Changeover Was Quite Easy. I Have A 700-R4 Out Of A 1984 C-10 Pickup,
Rebuilt Of Course. Items Needed To Changeover. A Dipstick Tube, And
Tailshaft Housing From A 1985 Chevrolet Camaro IROC. Jegs Adapter Plate,
And A 3½ Inch Cut Driveshaft. The Only Changes That Were Made, Was That
The Tailshaft Housing Was Changed, To Accommodate The Enginerred Mount.
The Mount Was Made With A Piece Of Steel Bent And Cut To Lye Under The Tailshaft
Housing. It Is Connected To The Aluminum With Bolts. The Bolts Are
Lock-Tite And Have Lock-Washers On Them. With The Steel Plate Connected To
The Housing, The 200's Offset Mount Was Welded To The Steel. This
Eliminated Any Crossmember Modifications. Everything Is Bolted Up And
Works Great. The T.C.C. Connection Was Also Modified. 3rd And 4th
Gear Switched Are Grounded To Enable T.C.C. Lockup. T.C.C. Wiring Is Wired
To Terminals A And D On The Tranny. For Pics Of All Of This Go
Here.
Also, To Hear How My Trans Shifts
With The 200, Watch This Video, And Listen To The Shifts.
