Axle shafts from non posi to posi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 04-22-2003, 04:32 PM

Is there any difference in the axle shafts from a posi to a non posi. I have the chance to get a posi gear set out of a wrecked 67 and I want to put it in my 72, but I wanna know if all the shafts are the same.

bpmcgee · 04-22-2003, 04:33 PM

Dubie,
I'm pretty sure they're identical. When I was having my axles worked on, we put an Eaton posi in the pumpkin, and I don't think we had to order different shafts.

Brian

dubie · 04-22-2003, 04:40 PM

right on!! looks like I'm gonna swap to a posi !!!

dubie · 04-22-2003, 04:44 PM

what about the pumkin cover, will it need to be changed?

cdowns · 04-22-2003, 04:49 PM

posi's work alot better with chrome pumpkin covers. if you change to posi be aware that there is a special additive that you have to use with the rear end grease

**StingRay** · 04-22-2003, 04:51 PM

Sorry Tim but 70 and up use longer axles than 69 down housings. The only way you can use that 67 housing is to use the 6 bolt axles or get custom axles. I have heard of people re-drilling bolt patterns as well but the idea wouldn't thrill me.

dubie · 04-22-2003, 05:20 PM

DAMN!!! ah well I'll go get it ,along with the axle shafts and see if there are any interested buyers here. Thanks guys

texnician01 · 04-22-2003, 07:44 PM

If I am reading your post correctly you are just trying to see if the carrier will fit the axles? the carrier will fit into any 12 bolt truck rearend long or short and use the axles that belong with that rearend. you want to change to a posi, easy just change the carrier. the axles all have the same splines and everything and they used the same axles regardless of posi or open. you should be able to swap carriers and not have to worry about a thing. just make sure you use the thicker gear oil for a limited slip/posi in it or you will burn up the clutches. the diff cover will work just fine there was no difference. the stock cover is usually a little stronger than a chrome jobbie though.

Nathan

Rod · 04-22-2003, 08:01 PM

dubie you can use the carrier and gears from the 67 into the 72. You may get away with just swapping carriers as long as the carriers have the same range of ratio gears.

Pretty much in these truck... 307 carrier is for 307 gears. and the 373 carrier uses 373 or 411 gears assuming this is all 1/2 ton stuff which Im pretty sure you have.

The axle spline count is the same on 67-72 axles but the lenght does change in 70 to a little longer. In 71 the axles have 5 bolt pattern compared to the older 70 down version which have 6 bolt.

Gears sets have to be from a matched pair, you cant take two of the same ratio gears and use the crown from one and the pinion from another... there machined as matched sets.

**StingRay** · 04-22-2003, 11:27 PM

Oh ya sorry about that I guess I didn't read that as thoroughly as I should have.

If you are going to change gears and/or carriers you will need to have somebody do it that knows what they are doing. Setting up a 12 bolt from scratch is a black art.

Ed ke6bnl · 04-23-2003, 07:30 AM

[QUOTE]Originally posted by texnician01
[B]If I am reading your post correctly you are just trying to see if the carrier will fit the axles? the carrier will fit into any 12 bolt truck rearend long or short and use the axles that belong with that rearend. you want to change to a posi, easy just change the carrier. the axles all have the same splines and everything and they used the same axles regardless of posi or open. you should be able to swap carriers and not have to worry about a thing. just make sure you use the thicker gear oil for a limited slip/posi in it or you will burn up the clutches. the diff cover will work just fine there was no difference. the stock cover is usually a little stronger than a chrome jobbie though.

Nathan [/B

When you say switiching carriers is no problem are you talking about also switching the pinnion.and all its spacers and crush sleeve. If you don't switch the pinnion do you have to reshim and check LASH, this is an issure I am dealing with right now. Thanks Ed ke6bnl

texnician01 · 04-24-2003, 03:02 PM

if you change the carrier you will have to set up the rear end all over again. yes you will have to check the lash and everything else. I havn't been to this point yet, so I can't answer many questions on how to set them up I'll have to look in a few books to do that. I just was saying that the carriers are interchangeable. whenever you change the carrier, ring gear or pinion you need to make all of the checks. Whenever you change one gear you should change them as a set. both new gears or a matched used set from the same rearend. I have had several people tell me that they are not hard just time consuming. I figure I just as well learn how.
Hope that answered your question.

Nathan

TERRYP · 04-24-2003, 03:32 PM

Does anyone know where to get info on rebuilding one of these rear ends? My posi is going out and I do not have a clue. Chevy shop manual?

cb · 04-24-2003, 10:47 PM

Richman Gear has made a VHS video that is very helpfull. About $10. Summit has them. Caution: rebuild requires a lot of special bearing removal tools and a hydraulic press. Also torquing crush sleeve is a real ***** with standard 1/2 drive tools.

04-22-2003, 04:32 PM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	Axle shafts from non posi to posi Is there any difference in the axle shafts from a posi to a non posi. I have the chance to get a posi gear set out of a wrecked 67 and I want to put it in my 72, but I wanna know if all the shafts are the same. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-22-2003, 04:40 PM	#3
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	right on!! looks like I'm gonna swap to a posi !!! __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-22-2003, 04:44 PM	#4
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	what about the pumkin cover, will it need to be changed? __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-22-2003, 04:49 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	posi's work alot better with chrome pumpkin covers. if you change to posi be aware that there is a special additive that you have to use with the rear end grease __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-22-2003, 04:51 PM	#6
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Sorry Tim but 70 and up use longer axles than 69 down housings. The only way you can use that 67 housing is to use the 6 bolt axles or get custom axles. I have heard of people re-drilling bolt patterns as well but the idea wouldn't thrill me. __________________ Saskatoon, Saskatchewan Canada

04-22-2003, 04:33 PM	#2
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Dubie, I'm pretty sure they're identical. When I was having my axles worked on, we put an Eaton posi in the pumpkin, and I don't think we had to order different shafts. Brian

04-22-2003, 05:20 PM	#7
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	DAMN!!! ah well I'll go get it ,along with the axle shafts and see if there are any interested buyers here. Thanks guys __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-22-2003, 07:44 PM	#8
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	If I am reading your post correctly you are just trying to see if the carrier will fit the axles? the carrier will fit into any 12 bolt truck rearend long or short and use the axles that belong with that rearend. you want to change to a posi, easy just change the carrier. the axles all have the same splines and everything and they used the same axles regardless of posi or open. you should be able to swap carriers and not have to worry about a thing. just make sure you use the thicker gear oil for a limited slip/posi in it or you will burn up the clutches. the diff cover will work just fine there was no difference. the stock cover is usually a little stronger than a chrome jobbie though. Nathan __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

04-22-2003, 08:01 PM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	dubie you can use the carrier and gears from the 67 into the 72. You may get away with just swapping carriers as long as the carriers have the same range of ratio gears. Pretty much in these truck... 307 carrier is for 307 gears. and the 373 carrier uses 373 or 411 gears assuming this is all 1/2 ton stuff which Im pretty sure you have. The axle spline count is the same on 67-72 axles but the lenght does change in 70 to a little longer. In 71 the axles have 5 bolt pattern compared to the older 70 down version which have 6 bolt. Gears sets have to be from a matched pair, you cant take two of the same ratio gears and use the crown from one and the pinion from another... there machined as matched sets. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

04-22-2003, 11:27 PM	#10
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Oh ya sorry about that I guess I didn't read that as thoroughly as I should have. If you are going to change gears and/or carriers you will need to have somebody do it that knows what they are doing. Setting up a 12 bolt from scratch is a black art. __________________ Saskatoon, Saskatchewan Canada

04-23-2003, 07:30 AM	#11
Ed ke6bnl Registered User Join Date: Mar 2002 Location: Agua Dulce, Ca. usa Posts: 179	[QUOTE]Originally posted by texnician01 [B]If I am reading your post correctly you are just trying to see if the carrier will fit the axles? the carrier will fit into any 12 bolt truck rearend long or short and use the axles that belong with that rearend. you want to change to a posi, easy just change the carrier. the axles all have the same splines and everything and they used the same axles regardless of posi or open. you should be able to swap carriers and not have to worry about a thing. just make sure you use the thicker gear oil for a limited slip/posi in it or you will burn up the clutches. the diff cover will work just fine there was no difference. the stock cover is usually a little stronger than a chrome jobbie though. Nathan [/B When you say switiching carriers is no problem are you talking about also switching the pinnion.and all its spacers and crush sleeve. If you don't switch the pinnion do you have to reshim and check LASH, this is an issure I am dealing with right now. Thanks Ed ke6bnl __________________ Ed ke6bnl Agua Dulce 70 S.E. Los Angeles 70 Chevy short bed 1948 F3 ford pu 1949 F1 stock V8 flathead 3 on floor 1950 F1 pu street rod 1948 F6 Ford Dually/350sbc no bed stock trans&rear 1972 El Camino 4" chop 1953 Chevy 3100 2b daily driver 1970 SB 4X4 400ci 6in lift

04-24-2003, 03:02 PM	#12
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	if you change the carrier you will have to set up the rear end all over again. yes you will have to check the lash and everything else. I havn't been to this point yet, so I can't answer many questions on how to set them up I'll have to look in a few books to do that. I just was saying that the carriers are interchangeable. whenever you change the carrier, ring gear or pinion you need to make all of the checks. Whenever you change one gear you should change them as a set. both new gears or a matched used set from the same rearend. I have had several people tell me that they are not hard just time consuming. I figure I just as well learn how. Hope that answered your question. Nathan __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

04-24-2003, 03:32 PM	#13
TERRYP GYRO GEARLOOSE Join Date: Jun 2000 Location: Nevada City, CAEverett, WA Posts: 361	Does anyone know where to get info on rebuilding one of these rear ends? My posi is going out and I do not have a clue. Chevy shop manual? __________________ Nevada City, CA Everett, Washington 57 3/4 rat, 235, 3spd 66 C-10 Panel, SWB. 350 from '68, 200R4 tranny, 3.07 rear ratio, restoring 68 C10 LWB 350 4spd, 4.56 rear dump runner 82 Camaro, 305, THM-200-R4 84 Monte Carlo 305 TH350, land tuna 85 Tercel SW, snow runner DISGRACED OUTLAW MEMBER OF THE DRUM BRAKE CLUB

04-24-2003, 10:47 PM	#14
cb Registered User Join Date: Oct 2000 Location: Gilbert, AZ USA Posts: 98	Richman Gear has made a VHS video that is very helpfull. About $10. Summit has them. Caution: rebuild requires a lot of special bearing removal tools and a hydraulic press. Also torquing crush sleeve is a real ***** with standard 1/2 drive tools. __________________ Craig Berland

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