Question about Hydramatic Slim Jim

bjtstarfire · 12-05-2006, 12:03 PM

Question about Hydramatic Slim Jim

It is my understanding that the 61 OLDS 88,98,Starfire if it has a Hydramatic had 3 flavors, designated by the following codes on the tranny id plate. They are as follows:

O 61 xxxxxxx (This was for the Olds 1961 2B carb car)
OA 61 xxxxxxx (This was for the Olds 1961 4B carb car)
OB 61 xxxxxxx (This was for the Olds 1961 Sstarfire car which had a 4B)

What is the difference? When you buy a tranny rebuild kit they differ in some way? The shop manual covers the repair for the hydramatic and it does not differentiate.

I just want to make sure I get the correct kit and understand why the 3 were categorized that way.

Ben

Oldsfan · 12-05-2006, 06:38 PM

The parts you get in a rebuild kit, like from Dave Edwards for example, are going to be the same regardless of transmission model - gaskets, seals, clutches and such. The main difference in these transmissions are in the valve bodies, which affects shift timing. Front pumps appear to be different, must be an oil pressure requirement thing. Otherwise they are the same.

Paul

bjtstarfire · 12-06-2006, 09:56 AM

It is good to know that the rebuild kits fit all 3 and they are the same.

What is the idea behind the pump pressures, does that higher or lower pressure equate to longer shift times? If you have a 4B carb do they stay in gear longer or shorter then a 2B model? Or is it something that you really would not even notice? Transmissions are tough to understand.

Ben

12-05-2006, 12:03 PM	#1 (permalink)
bjtstarfire Member Join Date: Nov 2006 Location: Greater Philadelphia, PA area Posts: 64	Question about Hydramatic Slim Jim Question about Hydramatic Slim Jim It is my understanding that the 61 OLDS 88,98,Starfire if it has a Hydramatic had 3 flavors, designated by the following codes on the tranny id plate. They are as follows: O 61 xxxxxxx (This was for the Olds 1961 2B carb car) OA 61 xxxxxxx (This was for the Olds 1961 4B carb car) OB 61 xxxxxxx (This was for the Olds 1961 Sstarfire car which had a 4B) What is the difference? When you buy a tranny rebuild kit they differ in some way? The shop manual covers the repair for the hydramatic and it does not differentiate. I just want to make sure I get the correct kit and understand why the 3 were categorized that way. Ben __________________ Ben '61 Starfire

12-06-2006, 09:56 AM	#3 (permalink)
bjtstarfire Member Join Date: Nov 2006 Location: Greater Philadelphia, PA area Posts: 64	It is good to know that the rebuild kits fit all 3 and they are the same. What is the idea behind the pump pressures, does that higher or lower pressure equate to longer shift times? If you have a 4B carb do they stay in gear longer or shorter then a 2B model? Or is it something that you really would not even notice? Transmissions are tough to understand. Ben __________________ Ben '61 Starfire

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12-05-2006, 06:38 PM	#2 (permalink)
Oldsfan Senior Member Join Date: Jul 2006 Posts: 424	The parts you get in a rebuild kit, like from Dave Edwards for example, are going to be the same regardless of transmission model - gaskets, seals, clutches and such. The main difference in these transmissions are in the valve bodies, which affects shift timing. Front pumps appear to be different, must be an oil pressure requirement thing. Otherwise they are the same. Paul