1969 Chevy Big Block P/S Pump Difference
 

There are two different style big block (396, 427) power steering pumps that are used on the following 1969 Chevrolet car line-up. Camaro, Chevelle, Nova, and Passenger car.

Both big block pump reservoirs had the inlet tube attached to the side of pump, unlike the small block which comes out the backside.

The inlet tube positioning is what determines the pumps application.

The Passenger car pump is used exclusively on that car as the inlet tube points away from the engine and has multible bends.

Camaro, Nova, and Chevelle all share the other style pump which the inlet tube points towards the engine, but there are internal differences.

All Camaro's, and according to the parts book some Chevelle's had high pressure pumps for variable ratio steering.

I have taken some pictures of two NOS GM pumps showing the external differences.

The Chevelle, Nova pump #7806372 can be found in parts book Group 6.605 which shows it is non-variable steering. I have taken pictures of that pump and it has a yellow sticker on it with the letters AF. The GM box is dated 5/13/69. This pump is also cosmetically the same as Camaro.

Power steering adapter kit #3960262 Group 6.508 is for Impala, Caprice, (exc Station Wagon). The pump from that kit has the yellow sticker with the letters AD.

The adapter unit #3960262 instructions shows that the hoses get clamped to the upper A arm shaft bolts, as there is a bracket enclosed. I can only assume that is why the inlet tube on the pump points away from the engine.



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None of the NOS parts are for sale in the pictures, and hopefully this will end the guess work on the pumps application.

- Warren

Re: 1969 Chevy Big Block P/S Pump Difference
 

nice work and great pics.

Re: 1969 Chevy Big Block P/S Pump Difference
 

Thanks Warren, very helpful.

Mike

Re: 1969 Chevy Big Block P/S Pump Difference
 

Thanks Warren
You really helped me to identify the 2 pumps I have [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Re: 1969 Chevy Big Block P/S Pump Difference
 

Almost like the early days of &quot;Hot Rod&quot; illustrations, well done [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Dan

Re: 1969 Chevy Big Block P/S Pump Difference
 

I knew Warren would have the parts to show the difference. The Camaro only parts are difficult to find. Thanks Warren.

Re: 1969 Chevy Big Block P/S Pump Difference
 

Thanks everyone for all the positive comments! I'm glad that my info was helpful.....Warren

Re: 1969 Chevy Big Block P/S Pump Difference
 

Warren,

Excellent tutorial, thank for providing the information.

Steve

I'm looking for a PS setup for my 69 but I've heard from a few places the 69 pump and brackets are a major PITA and I should get parts from a 70 instead.
Looking for comments/opinions.
Thx
Will

Purely comes down to do you want the engine to look like the engine came in the car originally? Or do you just want to do an engine swap? The power steering or any other component, for that matter, don’t know or care what they are in or which water pump used. But if you are going for a specific factory belongs there look, then stay with what is correct. Newer style brackets generally do have better adjusting for tension setups.