Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power WindowsRain Gear Wiper Systems
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy





Username Post: Definitively, can a 4L80E be fitted in a 67 Tunnel?        (Topic#353772)
mjc1 
Senior Member
Posts: 1478
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
11-05-18 08:54 AM - Post#2750505    

Can anyone here that has done it give some insight once and for all into what has to be done? I know there is a member here that did it in a yellow 66 (cant find him??), but that was an LS conversion, which probably moves the engine for or aft to a different spot then a Mark BB.
I know all the external stuff that needs to be done along with the cross-member mod and the banjo cooler fittings, it's just the tunnel and under seat floor bracing interference that concerns me somewhat. Everything else can likely be easily overcome.

Any thoughts?
Cheers and thanks, Mark

1967 Grande Parisienne 4DR HT
My Flickr page



 




9Teen67Biscayne 
"2nd Year" Silver Supporting Member
Posts: 110
9Teen67Biscayne
Loc: OK
Reg: 07-29-16
11-06-18 06:50 AM - Post#2750597    
    In response to mjc1

Mark - I don't have specific dimensions or comparisons but... on my 67, I installed a 2004r behind the LS...no modding of the tunnel - slid right in... one of the reasons I went that way was due to the area being tight. negatives with mine were increased cost to bulletproof the trans... but I do think the 4l80e is much larger and would require some enlarging of the area. Oh...here's the link to the yellow 66 that stuck the 4l80 in.
https://www.chevytalk.org/fusionbb/showtopic.php?t...

Tim Saepe Expertus- Semper Fidelis- Fratres Aeterni

"He must be the stupidest sonofabitch alive - but he sure is fast." - F. Gump


 
mjc1 
Senior Member
Posts: 1478
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
11-06-18 11:47 AM - Post#2750619    
    In response to 9Teen67Biscayne

Thanks for the reply Tim.
And thanks for the link. Looks like Gerald hasn't been here in a while.


1967 Grande Parisienne 4DR HT
My Flickr page



 
65_Impala 
Very Senior Member
Posts: 4099

Reg: 12-29-02
11-09-18 08:00 AM - Post#2750875    
    In response to mjc1

I can't see it being too difficult. The TH400 and 4L80e cases are very similar. The 4L80e is a little bigger in diameter in around the last 1/4 of it's length and the large part of the case is maybe 2" longer before the tail piece starts. The TH400 fit, so I can't see it requiring too much massaging to get the 4L80e in there.

Here is an example picture of both side by side to see the difference.

https://www.700r4transmissionhq.com/th400-vs-4l80e...







 
mjc1 
Senior Member
Posts: 1478
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
11-11-18 04:05 PM - Post#2751083    
    In response to 65_Impala

Yes, I can see that some interference might happen on the last few inches of the main case. There are some gussets that stick out pretty good. Maybe they can be trimmed down or rounded off just a little?
There is also a bulge for the forward planetary just behind the bell housing that the the 400 doesn't have.

1967 Grande Parisienne 4DR HT
My Flickr page



 
toro455 
"3rd Year" Silver Supporting Member
Posts: 510
toro455
Loc: Western NY
Reg: 06-15-02
11-12-18 02:04 AM - Post#2751115    
    In response to mjc1

Mark,
I don't know if I like this idea myself yet but one way to gain a small amount in the rear would be to lower the transmission mount position. That would primarily affect the rear because the pivot point would be the motor mount area. If the transmission cross member was lowered by something like 1/4" it seems it would be next to nothing in the front where the fan needs to go through the shroud. I've been making some of the transmission mount support brackets and I could change the bend point of the tongue to lessen the offset/step and that would in turn lower the mounting point. If I take too much out the ears which get welded to the vertical portion of the frame would need to be extended because they would get into the lower radius of the frame. At the moment I'm working with photos I previously took but you can probably follow the idea.

Obviously it would be great if it just fit but if it is so close that you think machining some bosses might help this might be another way to avoid touching the floor. You would still need to correct pinion angles. It would be easy to calculate the amount the front would tip up if we had the distance from the center of the motor mount to the front of the fan as well as the distance from the motor mount to the transmission mounting surface. I know the front face of the bell housing to the transmission mount point but I guessed at the rest of the dimensions in the example (we can easily adjust them).

The slight angle would slightly rock the motor mount but the angle would be very small. If the guesstimates are close about 0.30 degrees. The fan would come up by about 0.074”.

This also leads me to believe that if someone uses the wrong frame stands and does not realize it the answer to your question of whether it fits will change. Factor in tolerances and your question becomes difficult to answer.

Scott

Attachment: ImpalaTransmissionSupportBrackets.JPG (140.18 KB) 0 View(s)


Transmission cross-member support brackets


Attachment: TransMountHeightChangeExample.JPG (76.51 KB) 0 View(s)


Transmission cross-member height change example.




 
Shepherd 
Frequent Contributor
Posts: 1502

Loc: Lake George, NY
Reg: 11-11-15
11-12-18 04:55 AM - Post#2751117    
    In response to toro455

Nicely done



 




Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

158 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.288 seconds.   Total Queries: 14   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 04:27 PM
Top