Engine & Tranny Out of 4905

[chris4905]

I'm having fun now.  This bus isn't going anywhere for a while.   

Got the 8V71 and Spicer 4 speed out of the 4905.  This is a project that will at times have you questioning you own sanity.  LOL

Have a 6V92TA sitting at the other end of the shop, along with the V730.

I have the 8V71 off it's cradle and currently fabricating the cradle to accept the 6V92.  The V730 is waiting to be matched to the 6V92 and installed.

Got a used transmission air shifter from Luke, have to put together the control panel with the switch and lights.  If anyone could take a picture of their air shifter light panel I sure could use an example.

Last weekend took out all the old shifter and clutch linkage, removed the clutch pedal and shifter arm, etc, etc.  I think due to the constant lube of these items this was probably a dirtier project than the engine removal.

Have been on this project for a little over a month.  Takes lots of time while I'm still working every day.  Only have the evenings and weekends to work on the bus.

I have been taking digital photos from the very beginning of the project, must have a couple hundred of them now.  I'll post one every once in a while of different parts of the project.

PS....boy I sure hope I can put this thing back together....LOL

Chris Christensen
1974 GMC 4905 (with no engine or transmission)

[TomC]

Couple of pointers from one that just turboed and air to air intercooled my 8V-71.  Since the radiator is wide open-have the core rebuilt to the largest core that can be installed with the end tanks you have.  I had a 5 row straight fin core and went to a 6 row serpentine core for a 20% increase in cooling.  My transmission shell cooler is giving off alot of heat since Don Fairchild dynoed just the engine with the radiator and it didn't overheat.  So in addition to the radiator powered shell cooler for the V730, I'm installing a Hayden air to oil cooler with elec fan to be installed inbetween the hot port and the shell cooler to take out a big chunk of heat initially before it goes to the radiator.

Second point-when driving, don't be flooring it all the time.  Remember how fast you accelerated with the manual and try to accelerate that fast with the Allison.  With practice, your fuel mileage can be very close to what your manual was.

And finally-I can tell you that when you drive the bus with the new set up, you're going to have the biggest smile on your face-and then you'll also be saying why didn't I do this sooner?  Good Luck, TomC

[chris4905]

Hi Tom,

Thanks a lot for your comments and feedback.  I will give serious consideration to all your recommendations.

Can you give me any specs on the Hayden cooler.  Such as do they come in 24V, what capacity (do they come with a capacity rating ?), what model, etc., that you can recommend.

Thanks again for your time and comments.

Chris

[TomC]

Go to www.bulkpart.com and pull up high flow Allison cooler. Then go down to the ones with fan-I used the DB-341DC-12 for $470 + $46.50 for the thermostat and about $300 worth of fittings and hoses.  Not cheap, but then a burned up engine or transmission is expensive.  They don't list a 24v version, but I be they can make you one if you call them.  This is rated at about 31,000btu per hour heat removal.  I should have it in by this weekend, will let you know how it works.  Good Luck, TomC

[4104bigred]

do you know what you are going to do with the 8-71 and tranny??

I have a 4107 that needs a engine

chris 231 846 0880

[Brian Diehl]

Hi Chris,
Speaking as one whom is in the middle of his own repower I completely understand!  Sounds like you are approaching the fun stage of putting things together.  The tear down is the fastest and least rewarding part of the whole project.  Keep up the work and before you know it you'll be putting the motor back in. 
-Brian