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ZF Transmission and Cooler
Posted by solothurn100 (more from solothurn100) on Mon, 8 Nov 1999 11:18:03
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

After going through a second transmission change/rebuilt on a 1988 9k 
Turbo, the trans cooler was changed to the American type and fitted 
to the back of the radiator (above the turbo, before the A/C 
compressor). 
Seems that the reason for the original and first replacement trans 
failure was lack of fluid. This due to the vulnerable and cheaply 
built original equipment trans cooler located below the radiator and 
just behind the air dam. I went through a couple of these between the 
original and second replacement trans.

Question One:: I bought a new trans oil dipstick (with the plastic 
tip that always seems to fall off) at the dealer for $40 and I can 
never seem to get a decent reading of the fluid level. Was this due 
to the different cooler I have on? (Keep in mind low capacity and I 
have fewer fluid lines running around compared to original 
equipment).

Question Two: Was the change in location of the trans cooler in later 
models more successful (between side of radiator and right-side 
headlight assembly)? Is there a way to retro-fit the newer design to 
my 88?

Question Three: How much fluid capacity total do I really need? I 
recall something about the ZF on the 9k having a small coolant 
capacity compared to most other makes, which leaves less margin for 
overheating problems. Thus by using a standard American aftermarket 
trans oil cooler am I failing to address the real need for more 
capacity in the cooler system?

At this point I tend to overfill and the excess leaks out of the 
trans casing (erring on the side of too much fluid, with possible 
problems)

-Alvin
84 900S hatchback 150k (totalled in 91)
88 9000T 5 door 160K
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