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#1 |
screamin eagle
Join Date: Oct 2007
Location: westbury ny
Posts: 237
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1972 pickup screams on the highway
just picked up a 1972 pickup with a 350/350 w/3.73 gears-on the highway it screams at 60-what are my options?- the previous owner gave me the original 3.07 gears.-I could put them back in or I found a 700r4 already rebuilt .It was a 4x4 tranny,could I use it in my 2x4?What is involved in putting in this tranny-what would you do?
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SCREAMIN EAGLE |
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#2 |
Truck Enthusiast
Join Date: Dec 2006
Location: Arlington, WA
Posts: 1,346
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Re: 1972 pickup screams on the highway
I'd go with a 700r4. i belive all you need is a tail cone for the trans, make sure it is the same length and will mount to the cross member
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'85 swb |
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#3 |
Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: 1972 pickup screams on the highway
I have 3.73's with a 700r4 and it still screams on the hiway. Get used to it. Unless you want to go back to the 3.07's, thats just the way its going to be. I have thought about going to a 3.54 ratio if it can be gotten for this carrier, but haven't pursued it very far.
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1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
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#4 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,267
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Re: 1972 pickup screams on the highway
Your easiest fix is to reinstall the 3.07 rear end. That will put it back to where it originally was. It's a good all around gear. Or put in the 700R4 but it isn't just a bolt in. The TV cable has to be adjusted correctly or the trans won't last long. And depending on the trans it may not have cable drive for the speedometer. Then there is the lockup converter vacumn and electrical to wire in.
Red71. There is obviously something wrong with your setup if it's "screaming" with that combo. Use this online calculator to see what your combo should be turning. www.richmondgear.com street calculators . It lets you change the tire diameter, gear ratio and trans or OD trans to see what rpm the engine will turn at a certain speed. There are other online calculators but this is the one I use.
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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 |
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#5 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: 1972 pickup screams on the highway
If you go with the 700-R4 trans mission you will more than likey have to cut the drive shaft also to fit for the longer tail shaft of the transmission.
I have the 700-R4 and 4:10 gears and it does fine out on the interstate. I have the lock up torque convert to.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#6 |
Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: 1972 pickup screams on the highway
I guess maybe I don't understand what he means by screaming. My RPM's are around 2000-2500 around 60-65 MPH. My rearend has always been noisy though. Didn't matter if it had the 350 in it or the 700R4. May just be my rearend is noisy!
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1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
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#7 |
Registered User
Join Date: Apr 2004
Location: Las Vegas, NV
Posts: 2,188
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Re: 1972 pickup screams on the highway
Im confused as to why I see so many threads of people complaining with that drive train. Assuming you arent rolling around on 20" tall tires or something, 60 MPH with 3.73 isnt doing any harm to your drive train. Of course, it will wear slightly faster, but not so much so to be a concern warranting an expensive trans swap IMO. I drove 3.73's with a 28" tall tire and a TH350 on the freeway daily for a couple of years, just keeping an eye on my tach.
Not trying to start a flame or anything of the sort- and of course, do what YOU want with YOUR truck. Im just saying that your current setup is alright. The 3.07 swap sounds like a good idea if you already have the gears. It can be a little tricky if you have never done one before, though- and I suggest investing in some quality measurement tools. You will appreciate the 3.07's on the free way, but will miss the 3.73's leaving stoplights. If you do mostly city driving in it, gas mileage will likely decrease with the 3.07's as it will take more throttle to accelerate from a stop. If freeway driving is going to be frequent, the 3.07s will obviously do better on gas. Just some food for thought. If the actual motor whine is bothering you while driving, search around the forum for one of the many sound deadening threads. The stuff really does make an enormous difference. chevy72blu
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RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e |
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#8 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,267
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Re: 1972 pickup screams on the highway
Red 71. Oh I see what you are talking about now. Your rpms are ok but it's the rear end that's screaming. It has a whiny rear end. Look into a new gear set. Oh and the difference between the 3.73 and a 3.54 is only around a hundred rpm.
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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 |
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#9 |
Registered User
Join Date: Sep 2007
Location: Indianapolis, IN
Posts: 69
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Re: 1972 pickup screams on the highway
cheapest thing would be to put back the 3.07's, but if u still want that low end pull off the line and like the low rpm on the highway, then you could get a bigger torq converter. If you haul a lot though I would stick with the 3.73's and look into an overdrive...
If you have the money to spend, then I would either do a built 700R4 overdrive or get a 5/6 speed conversion which is more money and work but really cool to have then you could run 3.73 gears or more and have it all. |
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#10 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: 1972 pickup screams on the highway
We drive 90 mph these days with o/d,that`s the problem.Just roll that thing around 65 and enjoy.I scream my trucks when I feel like it,but slowing down these days.I ran my truck with 4.10s to Myrtle Beach from MD 75-80 all the way down I-95.It seemed very happy and I love that sound.I think alot of you only know riding with o/d.Other than fuel consumption,it`s not a problem.These trucks have been screamin`for over 30 years.
Bryan,I think doing an o/d will add value to your truck since that`s what people want these days.Keep the 3.73s and keep some grunt,yet get the final drive you want.I wouldn`t want 3.08s and o/d.The later 3.42s are as high as I`d want to gear a truck with o/d.Swapping the rear would be an easy quick fix.
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"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 ~ |
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#11 |
screamin eagle
Join Date: Oct 2007
Location: westbury ny
Posts: 237
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Re: 1972 pickup screams on the highway
thanks for all the input-I don't know if I could handle going 65,I usually cruise at 75.I don't mind the motor noise,I just don't want to beat on the truck
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SCREAMIN EAGLE |
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#12 |
Registered User
Join Date: May 2007
Location: Moore, Oklahoma
Posts: 2,396
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Re: 1972 pickup screams on the highway
Your not gonna hurt that motor at 65 mph -- it should be good for steady state cruising up to 3500 or 4000 rpm if needed (not recommended all the time tho)
Just get some quieter mufflers, a tach so you really know what its doing, and some Dynamat -- or Brown sugar - or whatever that stuff is called (help me out guys) Last edited by streetstar; 11-11-2007 at 07:08 PM. |
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#13 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: 1972 pickup screams on the highway
I think Special hit the nail on the head.Most of us are used to engines turning about 2000rpm's at 70-75 on the highway and it being quiet in the vehicle.In 1967-1972 that ain't so.The trucks were workhorses and just starting to be upgraded with PS.PB.A/C and other comfort items.Sound deadening was a high end car thing and wasn't as refined as today.You are probably hearing the normal noise a truck of this era makes and thinking it's way too loud compared to (insert your past DD here).
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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" |
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#14 |
screamin eagle
Join Date: Oct 2007
Location: westbury ny
Posts: 237
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Re: 1972 pickup screams on the highway
my last truck was a 72 Blazer with the same gears,the tires were a little bigger so the rpm,s was not as high-I am used to road noise
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SCREAMIN EAGLE |
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#15 |
Registered User
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
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Re: 1972 pickup screams on the highway
put what ever tranny you want in it. with low a$$ gears in the rear. itll always ride like that. change those babys out maybe sumthn higher that the original gears, youll lose some get up an go but gain some top speed and will be a smoooooooooooooooooooooooooooooooooth ride!.
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#16 |
Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: 1972 pickup screams on the highway
Not that you needed more input, but here is mine... lol
I drove my 67 all the way to Norwood 7 back (350 with 400 trans & unknown gears) On the way up we cruised 65-70 (did fine) On the way back I was pissed off & ready to get home, so I rolled up to 90 (but usually 80 @ about 3K) My truck did fine, so I think that as long as you're not too worried about MPG & your engine is well tuned you should be fine If it was me I'd leave it for a while, till I got the 700r4 in & then I'd decide if i wanted to change gears or not (3:42's are really good gears for 700r4's) Last edited by Spray-Bomb; 11-11-2007 at 11:32 PM. |
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#17 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: 1972 pickup screams on the highway
Yeah, we've gotten used to running at lower RPM's with the overdrive tranny's we have in our late-model's. Ain't the "scream" what we grew up hearing and then forgot about?? My youngest son, while riding in my '69, kept waiting and finally said, "When's it going to shift?" See? He grew up on O/D, not on 1:1 stuff.
I like my 3.08's and my TH400. If I had to use it for everyday commuting, I'd try for an O/D box. The 275-60's slow it down a hair, but I still like the "scream". However, if it was a "whiny hiney", I'd be looking for a good rear end.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#18 | |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: 1972 pickup screams on the highway
Quote:
I have 3.73's and I'm pulling around 2800 which I thought was pretty good
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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#19 |
Junior Member
![]() Join Date: Mar 2005
Location: Wilmington DE
Posts: 218
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Re: 1972 pickup screams on the highway
I have 3.73s in my 72 . On the highway at 75mph (I think ,my speedo is not right) I'm at 3200 all the time with a 28 inch tall tire.If your motor is in good shape I don't see a problem..
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72 cheyenne super BB402 TH400 Air Tack Tilt Posi P/S P/B AM/FM 12.96 @ 101.82 mph 60ft 1.82 12.39 @111.33 With a 180 shot nos 69 Camaro RS http://s94.photobucket.com/albums/l117/fdelcoglin/ email fdelcoglin@hotmail.com |
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#20 |
Senior Member
Join Date: Nov 2005
Location: northwestern wi
Posts: 2,111
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Re: 1972 pickup screams on the highway
iv'e got 373s in my 69 with a sm465 and 31" tires i like the way she sounds at 7o mph through the glass pacsi think i'm gonna go to 3.08s to save a little fuel though. i have a 700r4 but i'm not willing to give up my 4 speed thats what makes it a truck
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common sense isn't so common anymore |
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#21 |
I dun gradjiated collij!!!
Join Date: Jan 2006
Location: St. Helens Oregon
Posts: 1,751
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Re: 1972 pickup screams on the highway
Hence the name.
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Built NOT Bought. Viper Red 1971 LWB C10 355 Vortec W/700R4 4/5 drop AKA Screamin' You are missed!
2006 F150 XLT 5.4L Triton Rollin' on 22s the "F1" 67 C20 PS/AC/327/TH400 we call 'er "Bessie" 67 Malibu PS/ZR1-LS1 Brakes/350 Vortec/700R4 2/2 drop on 18" 338s - Tracy's "Boo" Boosted '67 Cougar EFI 5.0 HO roller motor/T5/8.8 Tracloc/ 4 wheel disks - "Project Panther" 79 Honda Z50 - stretched, cafe'd and hotrodded 125CC Lifan/5spd FEAR THE MONKEY! |
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