Originally posted by dpmac:
I just installed my 79 manual rack from AZ with MikeZ last night. It does not apear to be the "desirable" rack as described. Wish I had this info two weeks ago!
Oh well, if its not what I want I will return it and insure I get what I want.
Thanks for all the effort on your part.
Lots of luck actually getting the R/P you want.
Below is the information I was trying to complete.
Earl [img]graemlins/yellow.gif[/img] [img]graemlins/yellow.gif[/img]
Below is a SUMMARY (quickest to slowest) of all the Rack/Pinions available for the 79-93 Mustang. We need 2 more numbers to have COMPLETE INFO; Anyone work at a autoparts house???
The "RACK TRAVEL 1 TURN" number roughly equates to the ratio..... What little ratio information that exists MAKES NO SENSE when you cross reference it between brands/types.
Style . . . . . . . . LTL - rack travel LTL - Rack travel 1 turn… Description..
A. Atsco 64163.. 2.25 - 5.50 - 2.36 ,, Power “Sport GT 85-93 mustang power rack”
B. Atsco 6439.... 2.50 - ???? - ???? ,, Power “Sport Mustang 85-93 Power rack”
C. Atsco 6462.... 3.06 - 5.44 - 1.78 ,, Power “std 85-93 mustang power rack”
D. Manual 79-93. 3.25 - 4.75 - 1.46 ,, rebuilt rack (one of three Atsco 6812 interchangeable)
E. FR 1520......... 3.33 - 4.88 - 1.47 ,, Flaming River (15:1) Manual “Quick”
F. Manual 79-93.. 3.75 - 5.38 - 1.43 ,, rebuilt rack (one of three Atsco 6812 interchangeable)
H. FR 1503......... 4.00 - 5.00 - 1.25 ,, Flaming River (18:1) Manual
G. Manual 79-83.. 4.25 - 5.00 - 1.18 ,, rebuilt rack (one of three Atsco 6812 interchangeable)
Flaming River does not offer a Manual 79-93 Mustang rack at 13:1 according to their tech services dept.
The Flaming river Tech Services dept says the reason many of us are experiencing WONDERING when using power racks in the manual mode is because the power racks are made differently from the manual racks. Probably less crown to the rack… the Power racks rely on the hydraulics to maintain directional stability…. Sort of like Bills two shocks he installed on his car’s R/P.
Rack D seems to be very RARE….. advantage as quick at the FR 1520, with reduced movement should cause less scrubbing of wheels on F panels and A-arms. Disadvantage, Rebuilt…This is the Manual rack ID LIKE TO HAVE…
Rack F looks has the overall appearance of the FR rack and seems to be the most common Atsco 6812.
Rack G is a weird one piece casting that looks a lot like a powersteering unit (without the hose holes) seems to be shipped about 20% of the time as a Atsco 6812 VERY SLOW like the FR 1503… Could be a good R/P for a BIG BLOCK manual steering cobra. This is the rack I have and I DO NOT LIKE IT…
Rack H. A lot of folks ordering these for FFRs seem to be VERY UNHAPPY due to the slowness.
SUMMARY, If you want a REALLY QUICK R/P, you have to go with a Power steering rack… either manual or with the pump hooked up. Either the A, B or C rack. No one has reported using the B or C rack.
If you want a mid range quickness R/P the D, E or F rack is for you.
IF you want a really slow R/P go with the G or H rack.
IF you have Additional Info, Please post it…