my 1988 GMC 7000 dump truck story

[ryanv70c10]

Originally Posted by b454rat

Believe 502 is standard deck and 572 is tall....

GM made a tall deck 427 for the trucks

[sweetk30]

so if I was to go a big crazy and old school . . . .

would a 6v53 from a gradall grader be a basic bolt in ?

I found one local with engine / trans / rad from said unit with just under 1k hrs on it for 2k cash .

I have always loved the sound of a screemin Detroit and yes I know there NOISEY . I have a 2 stroke atv already so I am use to the sound.

I know the med duty stuff use to get these in them . just not sure if my 88 would be basicly equipped for it tranny wise / bellhousing stuff.

I can fab stuff for mounts and such easy .

[C10 - C90 Bill]

It would fit one way or another, but I don't believe any were available from the factory with one. Some of those years got the 4-53 though.

[sweetk30]

I know I got ideas floating all over in this thread .

a side from the tall deck diffrences why couldn't I just use a 454 I have ? ?

I know the tall decks were to make room for the 4th ring for extra oil control . and a few other things are different.

just hate to buy more crap I don't need / and why not use what I got in stock for years.

[b454rat]

Don't see why it wouldn't work. Might have to use the funky water pump with the weird outlet and fan location off a tall deck, but don't see why couldn't use electric fan....

[rkn463]

The regular 454 should work fine, I think the main challenge will be the bracket system. Anthing that bolted to the head and something else like the block may no longer fit because the head is farther away. It is doubtful that you could use the water pump off of the tall deck as it has to mate to the intake and block. The tall deck intake will be wider.

Still a good set of 454 brackets and I think you'll be good to go with minor modifications.

-Richard

[sweetk30]

look what showed up around 11:30 am today . . . . just fits past the lift arms on the shop lift . mirrors folded in for sure .

then after a few hr's of basic stuff the truck sneezed and blew its nose off.

after checking it over the motors is most likely junk . huge NON-coolent rust trails from head /block area on left side . 1 is the whole front face of the engine for the trail .

also tried to roll it over and it got to a point and stuck . . . that was with the battery hooked up. . . with huge pry bar it bound past ... I think few cylinders are rusted up from leak and sitting .

thanks to a local member junkyard hunting he told me a local yard 1hr east of me has a 427 tall deck create engine in a truck for cheep money . . going Tuesday to look at it and other small parts .

[sweetk30]

the baked to a crisp engine is out after tinkering with it the last few days here and there . today I dropped the manifolds back as 1 unit . then unbolted the starter and bell housing . once held with the hoist ( make sure legs are all the way out HEAVY motor ) I removed the front U-bracket mount and wiggle / jiggled / pryed her from the pins and up-out she come.

also have my eye's on a engine/tranny combo complete take out with everything on it already drop in / hookup and fire. waiting for reply on shipping price back from them .

[jdl71]

sub'd

[sweetk30]

well said screw it and undid few more items and popped tranny out also .

best time now to clean up / reseal / degrease the frame / get all ready to drop back in the hole.

p.s. its great having 2 engine hoists . . .

[Airdirect]

Wow, making good progress. Yes these parts are heavy and hard to handle. A second lift is a real blessing.

[sweetk30]

I hear ya buddy . . . . .

called on other motor/tranny combo they nock off 125 if keep tranny . . . the parts are worth more then that to me . . .

said $1150 shipped to local ( 10min drive ) terminal . drove to lot were they parted it . 125k miles . . .

lookin like this is the better way at this point since I found more carnage today ....... YES MORE DAMAGE ......... the clutch @ 66k miles is on the rivets and scorred both flywheel and pressure plate. what did they do to this thing .

hate to say it but wish I had a way to test the rear end at this point . cause if it was bad I would part it and make a BIG boy toy

[Airdirect]

Looking at the pictures, you have an Eaton 17201 or 17220 (23,000) rear end. I just changed my ring and pinion on mine from 5.29 to 4.56. My truck has a 4-53T Detroit Diesel which is governed at 2,500. With this change I now have a road speed of 67 MPH. These Eaton's are heavy duty rear ends usually found in larger trucks. I doubt anything a 366 could dish out would do any damage to this rear. The way to tell you have the heavy rear end is the axles are held in with 12 bolts (glove box will show the Eaton 17201 or 17220). Here is a link to my rear end ring and pinion replacement.

The 17220 is a later version with 32 splines, vs the earlier 16 splines, and a slightly different pinion carrier assembly.

http://67-72chevytrucks.com/vboard/s...d.php?t=729084

[sweetk30]

oh I know I got the 23,000 rear with 2 speed and 6.57 ratio . and has a lot of bolt/studs for the shafts .

I know its prob just fine . . . . but my luck ya never know.

[Airdirect]

Easy way to know is to pull the lower (bottom center of housing) drain plug. It is magnetic and if anything is afoul it will have parts attached to the magnet. Mine did not have anything on it, however a little fuzz would be normal. Great opportunity to drain and replace the gear grease.

[sweetk30]

more than I wanted to spend but in the end I think it will be worth it . and extra parts left over also . maybe resale some take off stuff.

also its the basic exact motor and combo I removed other than 1984 year .

even has newer remaned carb on it . looks like a fairly clean pull out job . stored with covered with air filter on it unlike lots of motors I have seen open or no carb and open for anything to get inside them

[sweetk30]

thanks to www.rockauto.com and there discount code I got the detail parts to clean up / reseal the motor and trans / tune it all up / hook up the cooling and a new luk clutch kit .
369.75 shipped all of it to my door.
17.09 saved discount wise with code.
who knows how much I saved on all of it over local chain store prices ? ? ?

thanks guys

cant wait to

[Airdirect]

You going to check the clutch?

[sweetk30]

you missed the info I just posted . . ..

new luk clutch . also fresh turned flywheel.

[sweetk30]

mmmmm smoothness

oh ya and a clutch kit.

[Airdirect]

Should not have any shudder with that setup! The 366 is a really good motor for medium duty trucks. I have been around school buses with the 366 and they will take lots of abuse. The 454 and 427 make more power, but also create lots more heat. I personally prefer the 366 as the best balance between power and longevity.

[Airdirect]

Could you post a good picture of your clutch fork boot? Mine is bad and I am looking for a replacement. I was wondering if it was the same as the gas engine units use.

The 4-53T Detroit Diesel with Clarke 390V 5 speed uses a "Clutch Rod Control Boot P/N 692930". The truck dealer I called said it was no longer available.

Thanks!

[ckfarm]

Originally Posted by sweetk30

mmmmm smoothness

oh ya and a clutch kit.

Is this the 454 or the 366 flywheel? just wanted make sure you know they are not interchangable - the 454 is counterweighted

[sweetk30]

yes I know 400sbc and 454 bbc ex-balanced units.

I kept the 366 engine option for stupid simple replacement .

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yes she is smooth to the touch . they switched over to a diamond cutting head and the finish these days is real nice and no comebacks . the older design cones would round over and then if a ridge they would smoth them over more than cut them flat . they said best upgrade they ever did to the machine.

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will see what I can do for a boot pic . mine is kind of o.k. but has few chunky spots.

[sweetk30]

oh ya I forgot I also dropped off my radiator and pressure tank setup at the local (30min drive each way ) repair shop .

clean / pressure test / fix basic leaks 65.00 bucks for rad and not sure yet on tank price to fix the missing hose nipple. I do have a line on a good used one if to much to fix.