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Old 03-20-2015, 12:34 PM   #1
68c10ratrod
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dont know which series my carrier is

im looking to put a posi in my truck. i'm not exactly sure which series i have now but i have 3.73 gears and would like to keep it that way. i was wondering if a 4 series posi would fit in a 3 seires
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Old 03-20-2015, 12:38 PM   #2
68350
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Re: dont know which series my carrier is

3.73 gears are a series 4 carrier. The different carriers cover a set of numerical gear ratios
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Old 03-20-2015, 12:49 PM   #3
68c10ratrod
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Re: dont know which series my carrier is

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Originally Posted by 68350 View Post
3.73 gears are a series 4 carrier. The different carriers cover a set of numerical gear ratios
alright cause the guy i got the truck from said it was a 3 series. but as i looked in to it, it didnt make sense cause the was a high gear for 3 series
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Old 03-20-2015, 01:34 PM   #4
bonnieclyde100
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Re: dont know which series my carrier is

they make 3.73 that will fit a 3rd series carrier. my truck originally had a 3.08 in it and I ordered a 3.73 that fit the 3.08 carrier. it is a Richmond I bought from summit racing so it is possible you have the same thing.
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Old 03-20-2015, 01:45 PM   #5
67 cst swb
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Re: dont know which series my carrier is

A variety of companies make both a 3 series 3.73's and 4 series 3.73's.
But OEM only had 4 series 3.73's.
If the previous owner rebuilt the rearend with a 3 series 3.73 to go on an originally numerically lower gear. Then you may need to check it out first.
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1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project
1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver
1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck
1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck
2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White
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Old 03-20-2015, 02:12 PM   #6
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Re: dont know which series my carrier is

Quote:
Originally Posted by 68c10ratrod View Post
im looking to put a posi in my truck. i'm not exactly sure which series i have now but i have 3.73 gears and would like to keep it that way. i was wondering if a 4 series posi would fit in a 3 seires
Identifying which series carrier you have is determined by measuring the distance between the face of the ring gear flange to the bearing seat on the ring gear side as shown in the photo. Series 4 has the greatest distance, series 3 in the middle and series two the least.
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Old 03-20-2015, 03:04 PM   #7
67 cst swb
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Re: dont know which series my carrier is

Quote:
Originally Posted by Fitz View Post
Identifying which series carrier you have is determined by measuring the distance between the face of the ring gear flange to the bearing seat on the ring gear side as shown in the photo. Series 4 has the greatest distance, series 3 in the middle and series two the least.
Excellent information Fitz !
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My Trucks:
1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project
1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver
1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck
1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck
2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White
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Old 03-20-2015, 11:12 PM   #8
68c10ratrod
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Re: dont know which series my carrier is

Quote:
Originally Posted by Fitz View Post
Identifying which series carrier you have is determined by measuring the distance between the face of the ring gear flange to the bearing seat on the ring gear side as shown in the photo. Series 4 has the greatest distance, series 3 in the middle and series two the least.
Thank you fitz. That's good stuff. I learn a lot on this forum
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