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  #1  
Old 01-04-2007, 11:13 AM
ninjaneer ninjaneer is offline
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Flexplate shims - Chevy diesel and AMC TH400

I'm in the middle of a 6.2 diesel swap and need help figuring out flexplate shims. Since the block will have an adapter plate (~1/4" thick) to mount to the AMC bellhousing, I'd assume that I need to shim the flexplate. Any idea how much shim I'll need?
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  #2  
Old 01-04-2007, 11:22 AM
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Cecil14 Cecil14 is offline
 
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Why not just run a chevy pattern TH400 with your guts in it?


aa
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  #3  
Old 01-04-2007, 11:53 AM
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Didnt the 6.2 have a buick BP?
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  #4  
Old 01-04-2007, 12:09 PM
ninjaneer ninjaneer is offline
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Quote:
Originally Posted by Cecil14
Why not just run a chevy pattern TH400 with your guts in it?


aa

Too much effort. I bought the Cherokee with a 305 bolted to the AMC TH400, so I'm just reusing the adapter plate.
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  #5  
Old 01-04-2007, 12:10 PM
ninjaneer ninjaneer is offline
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Quote:
Originally Posted by jeepsr4ever
Didnt the 6.2 have a buick BP?

The 5.7 diesel may have, but the 6.2 is a SBC bolt pattern, same as the 305 I'm replacing.
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  #6  
Old 01-04-2007, 01:18 PM
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I don't know if this helps, but AMC->GM tranny (0" adapter thickness) (AMC TH400 flexplate) requires ~1/2" spacers between the flexplate and the TC.

Mike D.
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Old 01-04-2007, 04:09 PM
8379qtj10 8379qtj10 is offline
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I have access diesel TH400 if needed.
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  #8  
Old 01-04-2007, 04:19 PM
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Cecil14 Cecil14 is offline
 
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Quote:
Originally Posted by ninjaneer
Too much effort. I bought the Cherokee with a 305 bolted to the AMC TH400, so I'm just reusing the adapter plate.

Is the tranny end of the crank the same for the 6.2s and the sbc? Can you just use the spacer and 6.2 flexplate?


aa
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  #9  
Old 01-04-2007, 06:15 PM
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Quote:
Originally Posted by Cecil14
Is the tranny end of the crank the same for the 6.2s and the sbc? Can you just use the spacer and 6.2 flexplate?
aa

you can bolt a SBC flexplate/flywheel to a 6.2,but they are balanced differently. the diesel also uses a different torque convertor,so if your adapter uses the amc th400 gas convertor,i dont think youll be happy with how the diesel acts with it.

also youll need the module and wiring from a factory diesel th400 if you want your tranny to shift right,since a diesel makes no vaccum to work the th400s shift modulator.

you said it was too much effort,but IMO if you want the best performance from your 6.2 you should sell the SBC adapter and find a diesel th400 and swap its guts into your case. or better,just find a diesel 700r4(did i just say that? )with a 208 behind it and run that behind your 6.2.i assume since youve got a th400,that youve also got a QT and a passenger side front diff,so using the chevy 700r/208 is no biggie.

i hate the 700r,but if you want to run an auto its your easiest/cheapest swap option. unless youre planning on running 2.73 or higher gears, the diesel will really benefit from the OD.

my 6400 lb home made crew cab with a swapped in 6.2/700/208 and a 4.10 geared C&C dually axle still gets 20 mpg with the OD. mileage will drop drastically with lower axle gears and a 1:1 high gear.

my 2 cents,for what theyre worth
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Last edited by scotty : 01-04-2007 at 09:58 PM.
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  #10  
Old 01-04-2007, 06:55 PM
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The PIG Smith The PIG Smith is offline
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Quote:
Originally Posted by scotty
you said it was too much effort,but IMO if you want the best performance from your 6.2 you should sell the SBC adapter and find a diesel th400 and swap its guts into your case. or better,just find a diesel 700r4(did i just say that? )with a 208 behind it and run that behind your 6.2.

I agree with these and all other comments here that suggest that you look for a GM Tranny,
whether it be a TH400 and use your existing QT or a 700R4 and the appropriate transfercase, a NP208 is a good case.

You could sell that AMC to GM adapter and make some coin to fund your GM transmission and transfercase.

Quote:
Originally Posted by scotty
i hate the 700r

Scotty, why do you hate the 700R4?
Sure, they had some early model, first generation teething issues, but GM corrected most of these.
Besides, a person can build a 700R4 with aftermarket components to take just about anything.
I've owned several and never had one bit of issues with them.

Because a Diesel does not generate vacuum for a modulator, a 700R4 is a great choice for a Diesel, no tranny computer,
throttle valve cable instead of a vacuum modulator, available Diesel torque converter and valve body.



Lots of great reading here about the 700R4:
Bowtie Overdrives Technical Articles
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Last edited by The PIG Smith : 01-04-2007 at 06:58 PM.
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  #11  
Old 01-04-2007, 07:50 PM
ninjaneer ninjaneer is offline
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Dang, why'd you guys have to go and complicate things?

I have a complete donor vehicle, an 84 Suburban with the 700r4/208, that I bought for cheap from a member.

The reason I wanted to avoid this combo was that the 700r4 doesn't have 1st (or is it 2nd?) and OD. According to the PO, someone rebuilt it, but apparently poorly.

A while back I did some searching and found that these two gears were related somehow, but since I don't know anything about ATs, I figured I'd just use the AMC TH400.

I now see that might not be such a good choice. So, how difficult might the 700r4 fix be, and could I use the stock Cherokee rear driveshaft? Would the 208 mount to the same crossmember as the QT?

Thanks for the answers so far...much appreciated.
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  #12  
Old 01-04-2007, 09:03 PM
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scotty scotty is offline
 
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Quote:
Originally Posted by The PIG Smith
Scotty, why do you hate the 700R4?

i am not a fan of the shushbox,period,and i think for most purposes that a good manual tranny is more reliable than an auto,since it is basically just a bunch of gears. since it doesnt use hydraulic pressures feeding thru different ports and servos,etc.,there is less that can go wrong.

more than anything,i just prefer to manually shift thru the gears.

i hate the 700r more than most mainly becasue of the experiences ive had with it. the one in my burb had no reverse when i got it,and no OD. all of my friends that have tried to use one in a modified truck,or a fast street car,has eventually gone back to the good old th350 after attempting to make multiple 700rs live.

they say you can build a 700r to take big power,but ive never seen it.maybe none of my friends have ever spent enuff $$ on one?

at any rate,the one in my home made crew cab is working,and i knock on wood whenever i tell someone that,hoping it will last long enuff to collect the parts i need install a 465 with a ranger OD. as much as i hate autos and the 700,i cant be without an OD with my diesel and 4.10 gears.

ninjaneer,if you want to use an auto,sell your adapter and have the 700 gone thru by someone who knows what hes doing. your engine will allready have the brackets for the TTV cable,wich will make it shift properly. it will save you alot of little headaches in the long run chasing down different things that you need to make the amc th400 work.

if you dont have any diesel swap expierence,feel free to ask whatever you need to know. my 6.2 powered truck was originally powered by a 305
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