North American Turbocoupe Organization



3.90 Gears...
Kuch Offline
Member
#1
So my 88 has the stock 3.55's in it, I come from the old school thought that a steeper gear helps, especially in a heavy TC and a lower torque 2.3. I know the 3.73's are kinda common in the auto TC's, but doesn't seem like much of an advantage over the 3.55's. 4.10's almost seem too much on the street, so how about some 3.90's in the 8.8? My 64 Galaxie runs 3.89's on the street and seem about perfect. According to Summit, there are 3 brands, ranging from $199 to $248 for a set of basic gears. Has anyone tried these at all? Thoughts?
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof, T3/T4 50 trim, 255LPH, BBK AFPR, 3" DP dual 2.5", MGW shifter, K&N, Gillis valve, RR cam
1964 Ford Galaxie 500XL, 390 6V, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 3 Speed, slow and low
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Jeff K Online
Administrator
#2
A 3.90 will render the already high ratio 1st gear nearly useless. Stock PCM goes into open loop over 3000 RPM, so cruising at over 65 MPH or so will put you in open loop = significant MPG reduction.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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