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  #1  
Old 01-28-2019, 04:19 AM
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swampedge swampedge is offline
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BOP turbo 400 ?

If I use a regular Buick turbo 400 instead of the Nailhead unit will it line up on the cross member mount the same as a Nailhead?
Thanks
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  #2  
Old 01-28-2019, 06:21 AM
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The nail head turbo 400’s have the starter bolted to them. As far as I know, the bop’s didn’t.
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  #3  
Old 01-28-2019, 09:36 AM
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I got one of each setting in the shed, Let me put a tape to them tonight.

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Old 01-28-2019, 10:27 AM
Ristow Ristow is offline
 
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on my '74 with AMC engine, i took the nailhead and adapter out,put in the later AMC TH400 in its place and everything lined up,so im gonna say yes it will be the same dimensionally.
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  #5  
Old 01-28-2019, 10:44 AM
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Dimensions very close, but Jeep "tilted" the th400 be it a nailhead w/ adapter or AMC bellhousing.
Front driveshaft will be in a different location and may create interference issues??
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  #6  
Old 01-28-2019, 04:50 PM
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I put the tape to both units
Nailhead is 22.5 long that is with out the adaptor ring and the is 2" thick
so we have 24.5 long

The BOP is 24.5 long

This measurement is without the tail shaft adaptor on it.

The starter on both mounts to the engine block on pass side

Soi you should have no problem using eather one. Just check your flexplate .


Andrew
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Old 01-29-2019, 01:54 PM
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Thanks Andrew. I thought they were the same as long as the TH400 Nailhead had the spacer measurements in the equation.
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  #8  
Old 01-31-2019, 02:29 AM
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Jeeps used the Buick Nailhead case with an adapter plate until 1973.

The BOPC and Nailhead cases are significantly different lengths because the Nailead block has a large mounting boss on the rear face of the block that surrounds the flywheel and serves a the front half of the bell housing, so the transmission case is actually very short. The starter on a Nailhead actually bolts to this giant boss on the block and on the driver's side. However, the AMC adapter plate blocks this off and moves the starter over to the passenger's side.

The BOPC case is not specific to where the starter bolts because the transmission case has nothing to do with the starter's mounting or operation. The starter on a BOPC engine bolts to the underside of the block, usually on the passenger's side, below where the transmission bolts to the engine.

Why are you trying to put a BOPC TH400 into your Jeep? There is no way an AMC engine will bolt to a BOPC case, only to a BOPC engine that will have motor mounts in different locations than on an AMC engine anyway.
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Old 01-31-2019, 07:09 AM
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From his profile he has a 1970 Jeep with the Buick 350 engine not a AMC engine.

Andrew
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  #10  
Old 02-04-2019, 05:45 AM
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Yeah, but he asked to use a "regular Buick" case instead of a Nailhead case, and the only other Buick case TH-400 aside from the Nailhead is the BOP-C and those are very different cases..
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  #11  
Old 02-04-2019, 09:19 AM
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Can you please tell me the differance betwene a BOP and a nail head with the adaptor ring for the Buick engine .
I have one of each setting in my shop side by side . and can't find any differance in the two.

The nail nead is out of a 1970 J2500 pickup with the Buick 350
The BOP is out of a 1970 Buick full size car.
Andrew
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  #12  
Old 02-04-2019, 08:37 PM
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The output shafts will be quite different, but either will bolt to the engine just fine.
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  #13  
Old 02-04-2019, 10:53 PM
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The car th400 won't have the o-ring groove on the output shaft for sealing inside the adapter bushing. Make sure the output shaft is the same length as the Jeep cased th400. There is a long and a short version. The cases are the same length (with the cast adapter on) and it will work. I put an o-ring on the th 400 output shaft and carefully put rtv on each side keeping it off the OD of the oring. I ran a buick car th400 in my 69 wagoneer after toasting my original trans towing in 100 degree heat on a 6 mile climb in stop and go construction traffic. I am now able to rebuild automatics and swapping the shafts is really the right way to go.

Use the Jeep vacuum modulator with the cast elbow and actuator lever and if possible, swap output shaft and you will be fine. Swapping output shafts is pretty easy I found. Just keep everything clean and in order. Change your front pump seals while it is apart. The starter bolts to the motor and no issue there.
I ran one and it will work.
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  #14  
Old 02-05-2019, 12:09 AM
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it is easier to use the short vacuum modulator just get the valve for it and it will clear the driveshaft
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  #15  
Old 02-06-2019, 09:05 AM
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I will have to look at the tail end of both trans.

Andrew
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