LS w/auto fitment issue

[McGuyver]

I dropped the LS w/4L70e auto trans in yesterday. Looks like I have a clearance issue on the rear corners of the pan. Right now the pan is sitting on top of the frame and the trans definitely needs to go lower. Others have just trimmed off the top of the offending bracket and that looks like the way to go. If I go that route and drop the trans 9/16" that will give me 1 degree down on the transmission. Other route is to slide the transmission under the frame, but that would be dropping the trans 1 7/8" and give me 3 degrees down. Not sure if the driveshaft would hit the floor if I go that way. Recommendations? This is my first attempt at posting pictures, hopefully it works!

[House Money]

I too really struggled with my LS3/4L75E combo. See my thread from several months ago I ended up trimming those brackets and the upper floor panel to get it to fit:

https://thefactoryfiveforum.com/showthread.php?35705-Is-my-transmission-sitting-too-high

Gary

[McGuyver]

Thanks Gary, after reviewing your efforts looks like I should trim some brackets and drop it down. I took some measurements and suspect I would have driveshaft clearance issues at full droop if I tried to slid the transmission under that bracket.
I did notice your engine mount triangular plates are stacked different that what I have too, your stack looks to bring the engine forward 1/4 inch or so from what I have now. May or may not need that but will keep it in mind. I have the standard shocks and think they might be too long too. I'll post another thread after I have looked into shocks some more.

[McGuyver]

Here are a few pictures of what I trimmed. It allowed me to drop the transmission down to where it needed to be. I was able to use the 1.09" spacers instead of the 1.25" spacers that came with the LS kit. Driveline angles look great, 1 degree down on the transmission, 3 degrees down on the driveshaft and 1 degree up on the pinion flange. At full droop with shocks in top hole the driveshaft just barely clears the rear floor lip.

[warren c]

Here are a few pictures of what I trimmed. It allowed me to drop the transmission down to where it needed to be. I was able to use the 1.09" spacers instead of the 1.25" spacers that came with the LS kit. Driveline angles look great, 1 degree down on the transmission, 3 degrees down on the driveshaft and 1 degree up on the pinion flange. At full droop with shocks in top hole the driveshaft just barely clears the rear floor lip.

Hi McGuyver, can you post some pictures that show which spacers was changed and location. Thank you

[McGuyver]

This is a shot from the passenger seat area looking forward. I recall the trans mount, bushing and brackets took a few minutes to figure out how to piece it all together. This is what worked for me. 151065

[edwardb]

I had to trim mine nearly exactly like you did with my LS3/4L65E trans combination. Also played with the spacers to get the optimum driveline angles and also with the driveshaft just barely clearing the rear edge of the floor. I too put the shocks in the top holes, even though the rest of the suspension is in the lower street height holes. Someone suggested that in my build thread and it's a great solution to limit the travel. I'd be very surprised if you have the wrong shocks. One other question. Do you have the LS installation instructions? It has the very specific way those triangular motor mounts are installed. http://www.factoryfive.com/wp-content/uploads/2016/06/Hot-Rod-LS-Fitment.pdf

As I'm sure you've realized by now, no possible combination would allow the tailshaft of the transmission to be under the floor versus above it. Just not designed to be installed that way and angles would be off my multiple inches.