Higgins56
Well-known member
- Joined
- Jan 2, 2012
- Messages
- 196
- Reaction score
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- Location
- Finland
- My Car
- 1971 Mach 1 Fastback now with 503 CID 4 bolt block with AFR Bullit heads , Edelbrock Performer RPM AirGap intake and ProSystems carburettor 1050.
4 sp Toploader with 9" Wavetrac rear.
Caltracs and shocks at the rear.
Hi Guys,
I have 429 engine with AC in my 71 Mach 1.
I bought a rebuilt Thompson pump 7 years ago and recently rebuilt the Saginaw gear ( 3 turns lock to lock)
When reassembling the gear the pump was untouched but changed a new belt with 1/2 inch "play" and tried to top the fluid level right there was a new noise attached - this whine that is almost unnoticeable when idling but when increasing rpm and turning the wheel the noice is too well audible.
I know that the noise is typical to some extent with these pumps but mine was satisfactorily silent before .
Maybe the pump is just worn out with the critical parts as it is not leaking and it powers the steering well....
I happen to have another Ford pump available type RF D8AC-3D609-AC which was used in the late seventies/ early eighties.
Has anybody tried that to swap the original Thompson to that ?
The pulley shaft seems to be the same but I have not tried the bolt pattern yet but it looks the same so I might use the original bracket to install that.
If it fits can I use the original pulley ( diam. 6 ") with that pump
Otherwise the pump is smaller in size than the original so it should fit well
Attasched two photos of the "new" pump - which I think was used in 70's Broncos and some commercial vehicles?
I have 429 engine with AC in my 71 Mach 1.
I bought a rebuilt Thompson pump 7 years ago and recently rebuilt the Saginaw gear ( 3 turns lock to lock)
When reassembling the gear the pump was untouched but changed a new belt with 1/2 inch "play" and tried to top the fluid level right there was a new noise attached - this whine that is almost unnoticeable when idling but when increasing rpm and turning the wheel the noice is too well audible.
I know that the noise is typical to some extent with these pumps but mine was satisfactorily silent before .
Maybe the pump is just worn out with the critical parts as it is not leaking and it powers the steering well....
I happen to have another Ford pump available type RF D8AC-3D609-AC which was used in the late seventies/ early eighties.
Has anybody tried that to swap the original Thompson to that ?
The pulley shaft seems to be the same but I have not tried the bolt pattern yet but it looks the same so I might use the original bracket to install that.
If it fits can I use the original pulley ( diam. 6 ") with that pump
Otherwise the pump is smaller in size than the original so it should fit well
Attasched two photos of the "new" pump - which I think was used in 70's Broncos and some commercial vehicles?