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Old 12-12-2012, 07:40 PM   #1
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3.73 Gears

So i was wondering with a tr-360 and 3.73 what rpm i would be at around 65 mph, i saw the video with the 4.10's but that cant be, my car right now stock is a 2000rpm at 65 his said 2000rpm at 65 with 4.10's any one have any input?
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Old 12-12-2012, 08:39 PM   #2
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Quote:
Originally Posted by buickregal79 View Post
So i was wondering with a tr-360 and 3.73 what rpm i would be at around 65 mph, i saw the video with the 4.10's but that cant be, my car right now stock is a 2000rpm at 65 his said 2000rpm at 65 with 4.10's any one have any input?
With my 3.73's I run 70mph 2150rpm about 2k at 65mph

are you sure that you have a stock diff?? I know I dont i installed mine, but did you by car new. a quick check is to jack the rear up (both wheels) and spin the wheels on full turn and check the driveshaft. it should almost turn 4 times with 3.73's and 3.25 turns with 3.27's
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Old 12-12-2012, 08:54 PM   #3
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Approximate RPM for 1999-2004 GT Manual with 3.73
Gear Speed
25 MPH 35 MPH 45 MPH 55 MPH 65 MPH 75 MPH
1 3888 5443 6998
2 2301 3221 4141 5061 5981 6902
3 1518 2126 2733 3340 3948 4555
4 1150 1610 2070 2531 2991 3451
5 782 1095 1480 1721 2034 2347

---------- Post added at 09:51 PM ---------- Previous post was at 09:48 PM ----------

Approximate RPM for 1999-2004 GT Manual with 3.73

Gear Speed
25 MPH 35 MPH 45 MPH 55 MPH 65 MPH 75 MPH
1 3888 5443 6998

2 2301 3221 4141 5061 5981 6902

3 1518 2126 2733 3340 3948 4555

4 1150 1610 2070 2531 2991 3451

5 782 1095 1480 1721 2034 2347

---------- Post added at 09:54 PM ---------- Previous post was at 09:51 PM ----------

Dumb formatting messed that up
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Old 12-12-2012, 08:59 PM   #4
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I will have to check it out, i got the car from an older couple and they said the car was bone stock but ill just have to jack it up and take a look. Thanks guys
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Old 12-12-2012, 11:03 PM   #5
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Don't fear the gear, 4.10s!
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Old 12-12-2012, 11:57 PM   #6
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Im sure u would know if they werent stock.
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Old 12-13-2012, 12:01 AM   #7
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A way to check what gears you have, have the car stationary and then check how much the driveshaft moves per wheel rotation. With 3.73s the driveshaft should make 3 and about 3/4 turns at the point that the wheels make 1 full rotation.
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Old 12-13-2012, 12:10 PM   #8
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Click here for my "How Fast Can I Go in Each Gear?" calculator...
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

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Old 12-18-2012, 11:21 AM   #9
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Sligtlty on topic does anyone know what oil is best to use in my rear end when I do my swap?
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Old 12-18-2012, 11:26 AM   #10
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Sligtlty on topic does anyone know what oil is best to use in my rear end when I do my swap?
70/90. RP already has additive.
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Old 12-18-2012, 11:28 AM   #11
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Thanks not trying to crash your thread just the one quick question 4:10s goin in this weekend
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Old 12-18-2012, 06:19 PM   #12
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Thanks not trying to crash your thread just the one quick question 4:10s goin in this weekend
Go easy on them. 15 miles, stop to cool, do it again, stop to coo diff, take it slow. Maybe 100 miles at normal street. It normal for old style gears, not modern tech, but be careful still. Break em in slowly.
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