what rear end do I have, 3/4 ton 1969 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RJ100 · 06-17-2005, 11:37 PM

I have a 1969 3/4 ton chevy with very low gears,I would like higher gears,what do I have and what can I use? Would appreciat any help. Thanks, RJ100

Robert1970C20rstbukt · 06-17-2005, 11:43 PM

If it looks like this, it's a Corporate axle with the Eaton third member. The only gears you can get for 'em are 4.10's, 4.56's, and 5.13's I think.

jostrans68 · 06-18-2005, 01:18 AM

you can get 3.9's from randys ring and pinion

*wolfthing2000* · 06-18-2005, 08:19 AM

If it is the Eaton, I would keep it ( do not tempt yourself to change axles). It is real easy to work on and instal new carrier. I just picked up one for 75.00 with excelent gears and instaled in one weekend (third member).
But they are my preference!

**special-K** · 06-18-2005, 09:10 AM

Jack-up the rear.Put a mark on thr rear housing nose and the yoke(lined up),and a mark on the backing plate and drum(lined up).Spin the wheel and count how many full turns the driveshaft makes to one turn of the wheel.After the last full spin of the driveshaft,see how far the d-shaft turns past the mark for the tire to complete it`s full turn.If the shaft spun 4 full and about a half,you have 4.56s.Five times and a little past,5.13s.Four times and a little past,4.10s.Then you`ll know what your options are to raise the ratio.Is your center-section round?That`s the Eaton HO52.If not,it`s a Dana60 and you can go to 3.73:1 with standard ring&pinion.

RJ100 · 06-18-2005, 09:32 AM

My 69 3/4 ton rear has coil springs, I am replacing coils with air bags. It looks like Roberts Picture,except with coils. What size am I looking for and where can I get Higher gears. It also has 4 speed trans. Thanks for all replies. Really appreciate the help. Ray, in WV

ckhd · 06-18-2005, 12:07 PM

The highest gears you can get are 3.90s. It is a VERY stout axle. I would compare it to a Dana 70, as far as strength. I have one in my '68 3/4 ton. The only thing that I don't like about it is that they haven't been made since 1972, and the parts availability is limited... including higher gears.

I have 4.57 gears in mine. Someday I'll get ambitious and either change them out to 3.90s or put a Dana 70 in.

06-17-2005, 11:37 PM	#1
RJ100 Registered User Join Date: May 2005 Location: roanoke wv Posts: 60	what rear end do I have, 3/4 ton 1969 I have a 1969 3/4 ton chevy with very low gears,I would like higher gears,what do I have and what can I use? Would appreciat any help. Thanks, RJ100

06-17-2005, 11:43 PM	#2
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	If it looks like this, it's a Corporate axle with the Eaton third member. The only gears you can get for 'em are 4.10's, 4.56's, and 5.13's I think. Attached Images __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck Last edited by Robert1970C20rstbukt; 06-17-2005 at 11:45 PM.

06-18-2005, 01:18 AM	#3
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	you can get 3.9's from randys ring and pinion __________________ [CGTW Member former 67-72 now with a 96 silverado

06-18-2005, 09:10 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Jack-up the rear.Put a mark on thr rear housing nose and the yoke(lined up),and a mark on the backing plate and drum(lined up).Spin the wheel and count how many full turns the driveshaft makes to one turn of the wheel.After the last full spin of the driveshaft,see how far the d-shaft turns past the mark for the tire to complete it`s full turn.If the shaft spun 4 full and about a half,you have 4.56s.Five times and a little past,5.13s.Four times and a little past,4.10s.Then you`ll know what your options are to raise the ratio.Is your center-section round?That`s the Eaton HO52.If not,it`s a Dana60 and you can go to 3.73:1 with standard ring&pinion. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 06-18-2005 at 09:14 AM. Reason: Spelling

06-18-2005, 12:07 PM	#7
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	The highest gears you can get are 3.90s. It is a VERY stout axle. I would compare it to a Dana 70, as far as strength. I have one in my '68 3/4 ton. The only thing that I don't like about it is that they haven't been made since 1972, and the parts availability is limited... including higher gears. I have 4.57 gears in mine. Someday I'll get ambitious and either change them out to 3.90s or put a Dana 70 in. __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

06-18-2005, 08:19 AM	#4
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	If it is the Eaton, I would keep it ( do not tempt yourself to change axles). It is real easy to work on and instal new carrier. I just picked up one for 75.00 with excelent gears and instaled in one weekend (third member). But they are my preference!

06-18-2005, 09:32 AM	#6
RJ100 Registered User Join Date: May 2005 Location: roanoke wv Posts: 60	My 69 3/4 ton rear has coil springs, I am replacing coils with air bags. It looks like Roberts Picture,except with coils. What size am I looking for and where can I get Higher gears. It also has 4 speed trans. Thanks for all replies. Really appreciate the help. Ray, in WV



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