newbie from Duarte

[czny]

Hi all!

I've been twisting wrenches on my own vehicles since '72 & decided to build a first gen 79 short bed for my move to NE Oregon.
Nothing too radical - 20Rhead/22R block, W56 w/4.7 dual transfer, 1" body lift, 3" spring lift(RUF/S10s or F150s), 33" or 35" tires.
Spartan lockers F & R, or Spartan front diff & Grizzly rear diff? Stock 4.37s or 4.88s?

[83 Crawler]

Welcome! I'm from Portland oregon

[czny]

Welcome! I'm from Portland oregon

Thanks!
I've got relatives in Bend, Eugene & Bandon on the coast.

I guess my question is: What is preferable for DD & trail use, Spartans F & R, or Spartan F & a Grizzly R with stock 4.37 gears?
I'll be resealing the F & R axles so while I'm in there what R&P ratio is generally preferred for 33"/35" tires?

 

[83 Crawler]

 529 for 35s and 488 for 33 and I like the grizzly locker

[czny]

529 for 35s and 488 for 33 and I like the grizzly locker

Thanks for input.
Does anyone bother with a rev limiter ignition like the MSD 6AL?
Or do you just depend on your tuner ears & hope your RPM doesn't run away going downhill? 

[Rocksurfer]

[79coyotefrg]

Thanks for input.
Does anyone bother with a rev limiter ignition like the MSD 6AL?
Or do you just depend on your tuner ears & hope your RPM doesn't run away going downhill? 

when I had my 20/22 hybrid engine i rarely got over 6500 rpm  but it did drop a valve at 7200 rpm once    once was enough

it depends on what cam you have what carb and what exhaust.  if all are large enough it will spin up that high but it would have to be a VERY long and steep hill for it to over rev the engine.   it just doesnt happen when you have dual cases and use them.

[79coyotefrg]

I would strongly suggest (assuming you havent already got the w56 transmission) to use the L52HD  Marlin sells.   you get the strength of the w56 in the length of the stock transmission giving you much better driveline angles in the rear.
I just about never use 5th gear with my 35's the engine runs cooler when running at 3600 rpm in 4th than 3100 in 5th (approx same speed+/- ) and I dont have to downshift at every bump in the highway.

[czny]

when I had my 20/22 hybrid engine i rarely got over 6500 rpm  but it did drop a valve at 7200 rpm once    once was enough

it depends on what cam you have what carb and what exhaust.  if all are large enough it will spin up that high but it would have to be a VERY long and steep hill for it to over rev the engine.   it just doesnt happen when you have dual cases and use them.

The engine build: Weber 32/36 w/adapter on a '77 intake(no EGR) port matched to cyl head, O/S int & ex valves(Engnbldr), Comp Cams 87-127-6(224* @.050" x .435" L), '83 cookie-cutter pistons in '83 tall block, LC Eng dual row chain & cam sprocket, Pacesetter headers 2" exhaust thru 2" cat & 2.25" series 40 Flowmaster. 

I'll just have to learn my shift points by ear then .

[79coyotefrg]

The engine build: Weber 32/36 w/adapter on a '77 intake(no EGR) port matched to cyl head, O/S int & ex valves(Engnbldr), Comp Cams 87-127-6(224* @.050" x .435" L), '83 cookie-cutter pistons in '83 tall block, LC Eng dual row chain & cam sprocket, Pacesetter headers 2" exhaust thru 2" cat & 2.25" series 40 Flowmaster. 

I'll just have to learn my shift points by ear then .

I'm scared to ask what you paid for your dual timing chain kit through them    a 20R chain kit from engnbldr would have been fine,  heck even one from autozone would be adequate.
the cam is a little mild but should do a nice job.   how long are those primary tubes on that pacesetter???

[czny]

I would strongly suggest (assuming you havent already got the w56 transmission) to use the L52HD  Marlin sells.   you get the strength of the w56 in the length of the stock transmission giving you much better driveline angles in the rear.
I just about never use 5th gear with my 35's the engine runs cooler when running at 3600 rpm in 4th than 3100 in 5th (approx same speed+/- ) and I dont have to downshift at every bump in the highway.

The W56 is already mated to the dual transfer case. I've got both the original & the donor vehicle front & rear drive-shafts. The local drive-shaft specialist has been building shafts since the early '70s & I can trust his work without a doubt. I haven't set the height of the skid plate in stone yet but would prefer a flat-er belly.
After reading more here, I think I'll opt for the 35s, 5.29 GR, TrueTrac up front & Grizzly rear diffs. First things first, getting the spring work done.



 

[czny]

I'm scared to ask what you paid for your dual timing chain kit through them    a 20R chain kit from engnbldr would have been fine,  heck even one from autozone would be adequate.
the cam is a little mild but should do a nice job.   how long are those primary tubes on that pacesetter???

My mistake. Only the dual cam sprocket from LC eng....the chain from Mizumi, a wholesale house.
The headers tubes are 1.5 dia. x 32 L, 2" collector.

[79coyotefrg]

My mistake. Only the dual cam sprocket from LC eng....the chain from Mizumi, a wholesale house.
The headers tubes are 1.5 dia. x 32 L, 2" collector.

really??  wow  where did you get them??

I have wanted to get an adjustable timing gear but Ive never done it.  I had too much fun without one

[yotacrawler1]

 

[czny]

Summit racing equip. Pacesetter 70-1072 headers. 'bout $162 now. & they're 2.5" dia. collector.

The cyl head had been cut .015", so the adj sprocket was to degree-in the cam correctly. I had bought a Engnbldr cam but the darn lobes weren't to specs at all. Lobe centers, duration & lift were all out of whack - & found all that too late to return it

[Danny de Bont]