Intro P10 kurbmaster reefer gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bldr · 10-04-2013, 07:33 AM

Hi I've been lurking for a while and finally trading my Chev express for this 73 Kurbmaster JR/p10 (pictures below). Being doing some work to get it road worthy again and found out the control arms are actually from 72...Dash looks pre 73 as well, so I'm posting here.

The rear gears are 4.11 and can't quite get up to highway (80km/hr) with a 292 and th350. I've searched and searched and thought the 3.08 might be better, but am wondering with it loaded with my tools it might be too sluggish taking off. I mostly drive city, but highway is normally 110-120km/hr 68-75 mph...Am i making a mistake with the 3.08 gear? Any one else put them in their p10?

Thanks!

**bigmac73** · 10-04-2013, 07:46 AM

just with the design of the truck , i would not go with 3.08 unless you had a standard transmission, there are other gear ratios available, 3.42, 3.73 and i think you can find a 3.55,
if you went with a 3.08 i think you would need to get a high stall converter just to keep some low end power

Bldr · 10-04-2013, 08:05 AM

Thanks, with the 3.42 I'll be running around 2800rpm to go 70 mph, is that a reasonable rpm for this engine? At least I won't have worry about speeding tickets on the highway anymore.

**bigmac73** · 10-04-2013, 09:41 AM

could not really say about a 6 banger, i only have owned one an old 250 in a nova back in the day , and i drove the piss out of it

dan42 · 10-04-2013, 09:54 AM

Not sure I would be too concerned about going 70 in that thing. It is literally a box on wheels. 3.73's would be fine, I would think. You only want to do it once.

**LockDoc** · 10-04-2013, 09:58 AM

I agree with Dan.

I think the 292 has quite a bit of low end torque so that will make a difference, but I think the jump from 4.10 to 3.07 would be too much of a change. I think the 3.42's are hard to find unless you buy a new ring and pinion set. I would try the 3.73 first, they are usually pretty easy to find. I'm presuming the P-10 has leaf springs so you would have to make sure whatever you get matches your spring configuration.

Oh, and

to the board.

LockDoc

PanelDeland · 10-04-2013, 10:10 AM

WELCOME!!!! I agree that the 3:73 is probably a better choice.It also is a great choice if you decide that a 700R4 is the way to go for a tranny.That would be the best of both worlds giving you good low end torque and allowing you an overdrive for hiway speeds/lower rpms.

**Boog** · 10-04-2013, 10:11 AM

If budget allows an overdrive trans might be a better alternative. That way you still have the 4:11 gears to get that thing moving and an rpm drop for highway cruising. Those old 6's will pull a dump truck or school bus. It will handle what you can put in it.

Bldr · 10-04-2013, 11:09 AM

Thanks for all the info, I'm getting that it's ok to be running 3000+ rpm highway then with the 3.73? They'll likely be new gears so I don't want to keep changing them out to see. I'll have to check the pricing on a 700r4.

10-04-2013, 07:33 AM	#1
Bldr Registered User Join Date: Sep 2013 Location: Brampton, ON Posts: 3	Intro P10 kurbmaster reefer gears Hi I've been lurking for a while and finally trading my Chev express for this 73 Kurbmaster JR/p10 (pictures below). Being doing some work to get it road worthy again and found out the control arms are actually from 72...Dash looks pre 73 as well, so I'm posting here. The rear gears are 4.11 and can't quite get up to highway (80km/hr) with a 292 and th350. I've searched and searched and thought the 3.08 might be better, but am wondering with it loaded with my tools it might be too sluggish taking off. I mostly drive city, but highway is normally 110-120km/hr 68-75 mph...Am i making a mistake with the 3.08 gear? Any one else put them in their p10? Thanks! Attached Images

10-04-2013, 07:46 AM	#2
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Intro P10 kurbmaster reefer gears just with the design of the truck , i would not go with 3.08 unless you had a standard transmission, there are other gear ratios available, 3.42, 3.73 and i think you can find a 3.55, if you went with a 3.08 i think you would need to get a high stall converter just to keep some low end power __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

10-04-2013, 08:05 AM	#3
Bldr Registered User Join Date: Sep 2013 Location: Brampton, ON Posts: 3	Re: Intro P10 kurbmaster reefer gears Thanks, with the 3.42 I'll be running around 2800rpm to go 70 mph, is that a reasonable rpm for this engine? At least I won't have worry about speeding tickets on the highway anymore.

10-04-2013, 09:41 AM	#4
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Intro P10 kurbmaster reefer gears could not really say about a 6 banger, i only have owned one an old 250 in a nova back in the day , and i drove the piss out of it __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

10-04-2013, 09:54 AM	#5
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: Intro P10 kurbmaster reefer gears Not sure I would be too concerned about going 70 in that thing. It is literally a box on wheels. 3.73's would be fine, I would think. You only want to do it once. __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

10-04-2013, 09:58 AM	#6
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,849	Re: Intro P10 kurbmaster reefer gears I agree with Dan. I think the 292 has quite a bit of low end torque so that will make a difference, but I think the jump from 4.10 to 3.07 would be too much of a change. I think the 3.42's are hard to find unless you buy a new ring and pinion set. I would try the 3.73 first, they are usually pretty easy to find. I'm presuming the P-10 has leaf springs so you would have to make sure whatever you get matches your spring configuration. Oh, and to the board. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

10-04-2013, 10:10 AM	#7
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Intro P10 kurbmaster reefer gears WELCOME!!!! I agree that the 3:73 is probably a better choice.It also is a great choice if you decide that a 700R4 is the way to go for a tranny.That would be the best of both worlds giving you good low end torque and allowing you an overdrive for hiway speeds/lower rpms. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

10-04-2013, 10:11 AM	#8
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,543	Re: Intro P10 kurbmaster reefer gears If budget allows an overdrive trans might be a better alternative. That way you still have the 4:11 gears to get that thing moving and an rpm drop for highway cruising. Those old 6's will pull a dump truck or school bus. It will handle what you can put in it. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

10-04-2013, 11:09 AM	#9
Bldr Registered User Join Date: Sep 2013 Location: Brampton, ON Posts: 3	Re: Intro P10 kurbmaster reefer gears Thanks for all the info, I'm getting that it's ok to be running 3000+ rpm highway then with the 3.73? They'll likely be new gears so I don't want to keep changing them out to see. I'll have to check the pricing on a 700r4.



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