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120 speedo in 88 TA

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Old 08-12-2011, 08:09 AM
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120 speedo in 88 TA

Been meaning to ask this for awhile. My 305 TPI 5 speed 88 TA has a 120 speedo...I assume this is normal? My 86 305 TPI car has the 140 speedo.

I sincerely doubt someone swapped a 140 for a 120, so I assume this was the case in 88 for a 305 car?
Old 08-12-2011, 09:26 AM
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Re: 120 speedo in 88 TA

My 1988 non-WS6 305 TPI 5-speed Trans Am had a 120 speedo, pretty sure it was factory.
Old 08-12-2011, 09:44 AM
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Join Date: Jun 2000
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Car: 99 WS6 / 00 SS / 11 CTS-V / 13 300
Engine: LS1 / LS1 / LSA / 5.7 Hemi
Transmission: 4L60E / T-56 / 6L80E / W5A80
Axle/Gears: 3.23 / 3.42 Auburn / 3.23 / 2.62
Re: 120 speedo in 88 TA

Mine's a WS6, but does not have performance axle...
Old 08-12-2011, 10:03 AM
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Re: 120 speedo in 88 TA

Same here on the performance axle. As best as I could tell it has the 3.08 gears.

As I recall the cars that got the 140 were the 350s and 305 TPIs with the performance rear axle.
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