TH350 Removal

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

kalger

Member
Joined
Nov 3, 2022
Posts
30
Reaction score
51
Location
Silverton, Oregon
First Name
Ken
Truck Year
1975
Truck Model
1500
Engine Size
350
I'm attempting to get my TH350 transmission out of my 1975 GMC C1500 with a 350 sbc. I can find two bolts that connect the transmission to the engine block. How many should I be looking for and any tips or tricks to a) find/see/feel the other ones, and b) get them out? Add to the "fun" that the area between the two has a wonderful combination of dirt, grime, and oil, it's making it a challenge to find anything. :)

I'm guessing they aren't that easily visible or accessible, so any help or suggestions would be appreciated.


Current state:
Transmission lines and cables are disconnected and out of the way.
Transmission fluid has been drained.
Drive shaft has been removed.
Transmission support cross bar has been removed.
Torque converter has been disconnected from the engine.
Transmission is on a transmission jack.
Engine is on a jack under the oil pan, but the engine mounts are still connected.
 

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,399
Reaction score
8,611
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
You will find 6 bellhousing bolts 9/16 heads 3 on each side 1 below the locating Dowell 1 above the locating dowell,and 1 more 1/2 way between the upper bolt you just found and the peak of the transmission up behind the distributor.
 

fast 99

Full Access Member
Joined
Dec 31, 2021
Posts
2,015
Reaction score
2,907
Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
6 bolts, 2 or more can be accessed from top with distributor out and other items removed like cruise if equipped.

Distributor will usually hit the firewall anyway when the engine sags.
 

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,399
Reaction score
8,611
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
Everyone has their own way but I get all 6 from the bottom and support the engine so the distributor doesn't hit I do pop the cap off. To get all 6 from the bottom you will need a long extension and a 9/16ths wobbly impact socket or a long extension and an impact wobbly universal and 9/16 ths socket. I have 2 very long 1/2 inch impact extensions for doing this,not sure if it could be done with 3/8ths drive. Got pics of stuff that would do it. Notice the wobbly not you're standard unversal,a regular universal gets bound up. Actually just checked Ebay the SKs like I have are listed I have had the 36" and the 20" at least 20 years and have used the crap out of them,they are the bomb pulling transmissions,you can reach all bolts from underneath,and hit them with the impact.
 

Attachments

  • Screenshot_2024-11-14_210939.jpg
    Screenshot_2024-11-14_210939.jpg
    72.5 KB · Views: 10
  • Screenshot_2024-11-14_211128.jpg
    Screenshot_2024-11-14_211128.jpg
    62.9 KB · Views: 11
  • Screenshot_2024-11-14_211550.jpg
    Screenshot_2024-11-14_211550.jpg
    56.6 KB · Views: 10
Last edited:

peats

Full Access Member
Joined
Dec 2, 2016
Posts
305
Reaction score
259
Location
Pennsylvania
First Name
john
Truck Year
72k5, 81c10 short step, 83k10 short fleet, 03 SSR. 25 chevy doodlebug
Truck Model
k5 c10 k10 SSR doodlebug
Engine Size
406 360 6.2 5.3 171
I don't know if you had the opportunity this time ,but I always degrease the work area before diving in.
 

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,399
Reaction score
8,611
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
I don't know if you had the opportunity this time ,but I always degrease the work area before diving in.
I always degrease myself,after I'm done.
 

Forum statistics

Threads
44,115
Posts
949,539
Members
36,209
Latest member
crazyriley1
Top