tranny help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mudmilitia · 12-20-2007, 01:11 PM

Got a 84 chevy 4x4 1/2 ton 4 speed auto. Driving down road it popped. wont shift into gear. Tryed shifting transfer case into 4 hi, shifted but nothing. Shifted tranny 1st thru 4 seemed like engine twisting.

Srubydo1986 · 12-20-2007, 01:51 PM

umm it broke, my cosin had this happen turned out he broke his transfer cas and rear half of transmission in his 88 blazer

68K20 x Drill · 12-20-2007, 02:29 PM

Got fluid?
How about noise?

mudmilitia · 12-20-2007, 03:34 PM

update: it had fluid in it , fired up at home . put into gear. driveshaft spins... same in 4 wheel drive. rear end s blown ? axle shafts?

**old Rusty C10** · 12-20-2007, 04:43 PM

if the drive shafts are spinning that would lead me to believe its in the rears but two at nce?? that sounds odd they would both go at same time

spudz · 12-20-2007, 08:25 PM

Quote:

Originally Posted by old Rusty C10

if the drive shafts are spinning that would lead me to believe its in the rears but two at nce?? that sounds odd they would both go at same time

He probably doesn't have the front hubs locked it

Thumpin455 · 12-20-2007, 08:29 PM

Yeah if the driveshafts are turning then the rear gears are gone. Lock in the fronts and see if it moves..

If you were closer I would swap the gears for you..

James McClure · 12-21-2007, 09:15 AM

Thump is right. Lock in the front hubs, put her in FWD and see if it moves. If it does front diff is OK. If it soesen't and shafts (2) are spinning you did the impossible and blew both rear ends (LOL). I would bet against that. The "pop" you said you heard would have been a GREAT big bang!! Take the cover off the pumpkin and look at the gears, you'll know right away if the ring and pinion are damaged. Check the spider and side gears. If you stripped the teeth off any of them you'll get the same symptom. Also look at the axel splines. I've never seen those strip out but I guess it is possible. If you had busted an axel you would have seen the wheel\tire assembly come right out. I live in Saratoga NY, is that close to you? Bring her on down and I'll fix ya right up. 30 some odd years tangeling with these things. I actually like doing differentials, must be nuts. LOL Hope I gave you some help, jim

mudmilitia · 12-21-2007, 01:49 PM

Hubs are always locked auto 4wd Thanx for replies . Hopefully after work tomorow ill open up the rears and check for chunks of metal. go from there

Hoods69BadBowTie · 12-21-2007, 02:38 PM

Damn that suxs but sounds like the rear end went out.

James McClure · 12-21-2007, 03:39 PM

Mud: If your truck is equiped with the auto hubs, chuck them in the trash yesterday. I've replaced or overhauled hundreds of them when they were under warrantee. Replace them with a set of manual hubs from Warn. Now. I want you to jack the truck up and put it on stands. We are going to check the front drive axels. Start engine, put truck in 4wd, engage the trans in low and leave it there. Get out and look at each side of the front drive axel between the ball joints. You should see the front drive axel "U" joint and it should be turning even if the wheel isn't. If the axel is turning and the tire isn't the hub is toast and replacing the hubs to manual will correct this. If you want you can call me on the phone and I'll explain it in detail. Send me a private e-mail or message and I'll give you the number. Hope this helps, jim

mudmilitia · 01-21-2008, 08:42 AM

Update: thanks for replies , Removed diff covers . Chunks of spider gear in the rear. Front seemed ok no fragments, just clean oil. so hubs are probably toast?.

James McClure · 01-21-2008, 09:24 PM

Mud: OK, now your getting someplace. GM sells a spider gear kit. It has everything you'll need to fix the rear diff except gasket and lube. It will help if you have the axel code off the top of the right side axel tube 4 or 5 inches from the pumpkin. Most good parts stores will have the replacement hub locks for the front. Warn is probably the best for the money. Make sure they are manual hubs. Jim

12-20-2007, 01:11 PM	#1
mudmilitia Registered User Join Date: Jan 2007 Location: ontario ny Posts: 31	tranny help Got a 84 chevy 4x4 1/2 ton 4 speed auto. Driving down road it popped. wont shift into gear. Tryed shifting transfer case into 4 hi, shifted but nothing. Shifted tranny 1st thru 4 seemed like engine twisting.

12-20-2007, 01:51 PM	#2
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: tranny help umm it broke, my cosin had this happen turned out he broke his transfer cas and rear half of transmission in his 88 blazer __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

12-20-2007, 02:29 PM	#3
68K20 x Drill Registered User Join Date: Apr 2007 Location: Freedom CA Posts: 488	Re: tranny help Got fluid? How about noise? __________________ 68 Chevrolet k20 Longbed 350 SM465/205, Dana 44, 14bolt, Power steering, Power Disk Brakes, 35" BFGs. 84 Chevrolet Suburban K20 6.2 Banks turbo TH400/NP208 Now with G80 68 GMC C20 Parts? Truck And a few cars

12-20-2007, 03:34 PM	#4
mudmilitia Registered User Join Date: Jan 2007 Location: ontario ny Posts: 31	Re: tranny help update: it had fluid in it , fired up at home . put into gear. driveshaft spins... same in 4 wheel drive. rear end s blown ? axle shafts?

12-20-2007, 04:43 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,281	Re: tranny help if the drive shafts are spinning that would lead me to believe its in the rears but two at nce?? that sounds odd they would both go at same time __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-20-2007, 08:29 PM	#7
Thumpin455 My truck is an alcoholic Join Date: Nov 2007 Location: Marquette Mi Posts: 303	Re: tranny help Yeah if the driveshafts are turning then the rear gears are gone. Lock in the fronts and see if it moves.. If you were closer I would swap the gears for you.. __________________ Too much stuff, too many projects to list everything. my 454 urged 76 swb beater

12-21-2007, 09:15 AM	#8
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: tranny help Thump is right. Lock in the front hubs, put her in FWD and see if it moves. If it does front diff is OK. If it soesen't and shafts (2) are spinning you did the impossible and blew both rear ends (LOL). I would bet against that. The "pop" you said you heard would have been a GREAT big bang!! Take the cover off the pumpkin and look at the gears, you'll know right away if the ring and pinion are damaged. Check the spider and side gears. If you stripped the teeth off any of them you'll get the same symptom. Also look at the axel splines. I've never seen those strip out but I guess it is possible. If you had busted an axel you would have seen the wheel\tire assembly come right out. I live in Saratoga NY, is that close to you? Bring her on down and I'll fix ya right up. 30 some odd years tangeling with these things. I actually like doing differentials, must be nuts. LOL Hope I gave you some help, jim

12-21-2007, 01:49 PM	#9
mudmilitia Registered User Join Date: Jan 2007 Location: ontario ny Posts: 31	Re: tranny help Hubs are always locked auto 4wd Thanx for replies . Hopefully after work tomorow ill open up the rears and check for chunks of metal. go from there

12-21-2007, 02:38 PM	#10
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: tranny help Damn that suxs but sounds like the rear end went out. __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

12-21-2007, 03:39 PM	#11
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: tranny help Mud: If your truck is equiped with the auto hubs, chuck them in the trash yesterday. I've replaced or overhauled hundreds of them when they were under warrantee. Replace them with a set of manual hubs from Warn. Now. I want you to jack the truck up and put it on stands. We are going to check the front drive axels. Start engine, put truck in 4wd, engage the trans in low and leave it there. Get out and look at each side of the front drive axel between the ball joints. You should see the front drive axel "U" joint and it should be turning even if the wheel isn't. If the axel is turning and the tire isn't the hub is toast and replacing the hubs to manual will correct this. If you want you can call me on the phone and I'll explain it in detail. Send me a private e-mail or message and I'll give you the number. Hope this helps, jim

01-21-2008, 08:42 AM	#12
mudmilitia Registered User Join Date: Jan 2007 Location: ontario ny Posts: 31	Re: tranny help Update: thanks for replies , Removed diff covers . Chunks of spider gear in the rear. Front seemed ok no fragments, just clean oil. so hubs are probably toast?.

01-21-2008, 09:24 PM	#13
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: tranny help Mud: OK, now your getting someplace. GM sells a spider gear kit. It has everything you'll need to fix the rear diff except gasket and lube. It will help if you have the axel code off the top of the right side axel tube 4 or 5 inches from the pumpkin. Most good parts stores will have the replacement hub locks for the front. Warn is probably the best for the money. Make sure they are manual hubs. Jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.



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