TwinTurbo.NET: Nissan 300ZX forum - The best solution to highway cruising is to keep the set up
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Subject The best solution to highway cruising is to keep the set up
     
Posted by Gordo LSZ Daytona on August 14, 2020 at 1:14 PM
  This message has been viewed 104 times.
     
In Reply To Guys with the Q45 diff swap posted by RobZ32 on August 13, 2020 at 06:24 PM
     
Message in the rear, and change the trans for a T-56 wide ratio double overdrive. The top gear is 0.51, cutting rpms in half. Gearing is pretty close to our 5 spd for the first five gear sets. Tremec designates trans models as "TUET"s

TUET 5044 (Cadillac 04-07 CSTV)
2.97
2.07
1.43
1.000
0.84
0.56

TUET11009
2.66
1.78
1.30
1.00
0.80
0.64
2.90 R

TUET11012
2.97
2.10
1.46
1.00
0.74
0.50
2.90 (R)

For comparison, Z32 5-speed:
1st - 3.214
2nd - 1.925
3rd - 1.302
4th - 1.000
5th - .752
Final: 3.69 TT or 4.08 NA

With a 3.54 diff, at expressway speeds of say 65-80 mph; the engine rpm in my cars stays between 2100-2300 rpm depending on tire size. Basically loafing just under the torque curve.

There was a guy here who was selling bellhousing adaptor kits, but as I recall the price was prohibitive. LOJ, the LS swap guru, was interested in developing an adaptor, but not sure if the project even got off the ground.

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