Are these two PS pumps interchangeable? Gts-t and Gts-4

[m_melen]

Can anybody confirm if these power steering pumps are interchangeable? The first pic is my noisy 1991 GTST pump, the second is the pump I took off Rabbit's GTS-4. The main difference I see is that the large nipple that attaches to the reservoir appears to have a split or diverting pipe on the Gts-4 pump. I haven't modded the steering system/hicas on my car, and have no intention to. Can I use this gts4 pump?

[Voodoo_ChildR32]

They look the same, only way to find out is to try. Just took a look at mine(gts4) and I have that small line as well.

[beacher1B0]

Parts Master says Rwd pump fits Rwd only. Doesnt mean it wont work tho. Try it and let us know, and if it works post it in Compatible parts section please.

[Bravo]

You need to take it apart and remove the fins from the rear impeller!

[m_melen]

Could you explain the difference between the pumps? Why would the awd models have fins that a rwd doesn't?