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It is the final drive that is shorter, not the ratios Posted by MTAERO [Email] ![]() ![]() In Reply to: here is how the closer ratios help., Nahum Cook, Wed, 20 Sep 2006 09:04:00 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The final drive being shorter by 10% over what we have in our 9000's is what most people are misinterpreting as the "ratios being closer".
The 4.05 final drive has 21 teeth driving a 85 tooth ring gear mounted on the differential. The 3.61 final drive (our 9000's) has 23 teeth driving a 83 toothring gear.
now here is the confusing part of the analysis. 23 theeth driving 83 has a distinct advantage over 21 teeth driving 85. This means that the 9000 final drive should be the strongest. Why do we see so many fail?
What is the solution? ...
Stronger cases is one important aspect and Saab approached this in the 96 model year gearboxes...check the serial number on your tranny if it begins with M you have the newer cases.
See the pic below showing the main upgrade part in the later. It is in the reinforcement more than in the cases themselves.
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