90-95 Power steering pump solution

[GOLDCYLON]

Howdy. Passing this information onto the brotherhood. Cliff please save this info. When sourcing a power steering pump for an early 90 or 91 Z a power steering pump appears the same as a standard pump on all C4s 84 up to a 91. You will see this at Ecklers and Rock auto for instance.

They are not.. The power steering pumps ARE ZR-1 specific. if you are not getting a cast iron vs aluminum body its not the right pump as the bosses and threaded portions are wrong.

So. SOLUTION?.. Volvette.com has a 90-95 Power Steering rebuilt pump part number 4PS80D there is a core charge but its is a cast iron body like the original. To the left you see the rebuilt cast iron pump. Pics 2 and 3 are the aluminum incorrect replacement next to the old pump.


BOTTOM LINE UP FRONT?.. Power Steering pumps for ZR-1s are ALL ZR-1 specific for the 90-95 model years.
GC. :cheers:

[conesare2seconds]

Thanks for the heads up.

[GOLDCYLON]

Thanks for the heads up.

No problem..if I can save a forum brother time and effort..it is worthwhile. Even GC buys the wrong part from time to time.

The pump is buried under the motor?.. So until you are in there and you have the part in hand, it is hard to know. GC

[secondchance]

Howdy. Passing this information onto the brotherhood. Cliff please save this info. When sourcing a power steering pump for an early 90 or 91 Z a power steering pump appears the same as a standard pump on all C4s 84 up to a 91. You will see this at Ecklers and Rock auto for instance.

They are not.. The power steering pumps ARE ZR-1 specific. if you are not getting a cast iron vs aluminum body its not the right pump as the bosses and threaded portions are wrong.

So. SOLUTION?.. Volvette.com has a 90-95 Power Steering rebuilt pump part number 4PS80D there is a core charge but its is a cast iron body like the original. To the left you see the rebuilt cast iron pump. Pics 2 and 3 are the aluminum incorrect replacement next to the old pump.


BOTTOM LINE UP FRONT?.. Power Steering pumps for ZR-1s are ALL ZR-1 specific for the 90-95 model years.
GC. :cheers:

GC,

Did your power steering pump fail? Any idea what caused the failure? If due to age, how many miles?

[Erik]

Howdy. Passing this information onto the brotherhood. Cliff please save this info. When sourcing a power steering pump for an early 90 or 91 Z a power steering pump appears the same as a standard pump on all C4s 84 up to a 91. You will see this at Ecklers and Rock auto for instance.

They are not.. The power steering pumps ARE ZR-1 specific. if you are not getting a cast iron vs aluminum body its not the right pump as the bosses and threaded portions are wrong.

So. SOLUTION?.. Volvette.com has a 90-95 Power Steering rebuilt pump part number 4PS80D there is a core charge but its is a cast iron body like the original. To the left you see the rebuilt cast iron pump. Pics 2 and 3 are the aluminum incorrect replacement next to the old pump.


BOTTOM LINE UP FRONT?.. Power Steering pumps for ZR-1s are ALL ZR-1 specific for the 90-95 model years.
GC. :cheers:

Thanks, GC.
That's great info!

[GOLDCYLON]

GC,

Did your power steering pump fail? Any idea what caused the failure? If due to age, how many miles?

Yes it was leaking at the 154k point

[1991 Corvette ZR-1]

Great information. Yep, avoid the ?Fits 1990-1995 ZR-1? from places like Corvette Central. I picked one up and had to promptly send it back. Indicated in great detail that they are carrying the wrong part. Still up for sale on their website. Not sure who is in charge of their parts supply but they aren?t familiar with ZR-1s. Just rebuilt mine like I should have in the first place.

[GOLDCYLON]

Great information. Yep, avoid the ?Fits 1990-1995 ZR-1? from places like Corvette Central. I picked one up and had to promptly send it back. Indicated in great detail that they are carrying the wrong part. Still up for sale on their website. Not sure who is in charge of their parts supply but they aren?t familiar with ZR-1s. Just rebuilt mine like I should have in the first place.

It's the same all around EBay, Rockauto, autozone etc... fits ZR-1

This is why this information needs to reside HERE as the subject matter experts for the ZR-1 brotherhood. This is why this is here to SHARE....

GC :saluting:

[geezer]

91 CorvetteZR-1: Did you use a rebuild kit ? If so where did you source it?

[Bruce Hazell]

Hi. I need to replace my pump apparently and just read the post about the aluminum replacement pumps not fitting correctly. I see that Corvette Central advertises the pumps for ZR-1s now on their website. They look to me to be aluminum ones..can you advise if these would then not fit now or do you think they may have corrected the fit since 2 yrs ago when the original post was written??

[GOLDCYLON]

Hi. I need to replace my pump apparently and just read the post about the aluminum replacement pumps not fitting correctly. I see that Corvette Central advertises the pumps for ZR-1s now on their website. They look to me to be aluminum ones..can you advise if these would then not fit now or do you think they may have corrected the fit since 2 yrs ago when the original post was written??

I would not take the chance and suggest getting your leaking OEM pump rebuilt.

The one I ordered from volvette was reversed geared as for a Cadillac Northstar. I informed them of the problem and returned em for a refund. Did they correct them ? I have no idea. I would not want to relive the 4 installations it took me to determine the problem but the place I had the original rebuilt determined the components were reversed internally by design. Again for a Cadillac Northstar vs a LT5 ZR-1 Corvette. Bluntly it was a total PITA.

[RedThunder]

Hello all,
I just installed a modified aluminum ps pump that was modified by TurnOne in Saginaw, MI (989-759-4206). I talked with Mark and he was extremely helpful.
The whole process was not a particularly easy job (5 hrs), but the TurnOne modified ps pump fit perfectly and, so far, is performing flawlessly. I'm very pleased after reading the ps posts here and being unable to find either a used or OEM replacement. Fair warning: it's releatively costly as it's a custom modification so it fits and works.

[Dynomite]

Information is saved in Post 5 - ZR1 Drive Train

Thanks Daryl :cheers:


STEERING
90-95 Power Steering Pumps Are ZR-1 Specific (https://www.zr1.net/forum/showthread.php?t=33275)
Power Steering Pump Repair Kit (http://zr1.net/forum/showthread.php?p=298797)
Replacing Power Steering Pump TIPS (http://www.zr1.net/forum/showthread.php?p=137721)
Make Your Own Power Steering Lines TIPS (http://www.zr1.net/forum/showthread.php?p=193368)
Sources of Fittings for Power Steering Lines TIPS (http://www.zr1.net/forum/showthread.php?p=193396)
Loose steering column TIPS (http://www.zr1.net/forum/showthread.php?p=192611)
Dimmer Switch TIPS (http://www.zr1.net/forum/showthread.php?t=15404&highlight=dimmer+switch)
Replacing tie rods (http://www.zr1.net/forum/showthread.php?t=12182)
Tie rod dust boots (http://www.zr1.net/forum/showthread.php?p=95462)
Rubber bushing kit (http://www.zr1.net/forum/showthread.php?p=95974)
Tilt Steering column wobbling (http://www.zr1.net/forum/showthread.php?t=16733)
Removing air bag (http://www.zr1.net/forum/showthread.php?t=16307)
TurnOne (http://www.turnone-steering.com/)

[Bruce Hazell]

Thanks people!!!! Mechanice thinks it MAY just be the ps inlet hose which I just ordered and received from Corvette Central!! In the meantime just add fluid when needed :)