matrophy Posted June 18, 2020 Report Share Posted June 18, 2020 Planning on pulling my 5-speed in my '86 (5/85 build) 720 and per my Haynes manual, you are supposed to be able to drop the tranny out the bottom by itself. I have heard from a couple of people what a bitch that job is because of clearance issues but that it is doable. One of my 720 Facebook friends says he recommends pulling engine and trans together. That seems like more unbolting and un-attaching extraneous stuff but if it is easier overall I have no problem with going that way. My jack stands will extend 17" and I am not clear how tall the tranny is overall to know if the tranny jack I might rent (4" profile according to tool rental place over the phone) and the tranny will come out the bottom and roll away. It also seems like the fixed crossmember in the frame might be problematic. What is the suggestion here for the easiest way to do this? 1 Quote Link to comment
banzai510(hainz) Posted June 18, 2020 Report Share Posted June 18, 2020 one really need to jack the front of the truck up to pull both and have a end cap on the trans out put over wise all the oil comes OUT!!!!!!!!!!!!!!!!!!!!!!!!!! 1 Quote Link to comment
Charlie69 Posted June 18, 2020 Report Share Posted June 18, 2020 I pull them together. The 720s have a removable cross member which makes this much easier than the earlier trucks. If you only need the trans out then just pull the trans. Quote Link to comment
Stoffregen Motorsports Posted June 19, 2020 Report Share Posted June 19, 2020 20 hours ago, Charlie69 said: I pull them together. The 720s have a removable cross member which makes this much easier than the earlier trucks. If you only need the trans out then just pull the trans. Removing the crossmember under the engine may give you extra wiggle room to get it out. 21 hours ago, banzai510(hainz) said: one really need to jack the front of the truck up to pull both and have a end cap on the trans out put over wise all the oil comes OUT!!!!!!!!!!!!!!!!!!!!!!!!!! Or just drain the trans ahead of time. 1 Quote Link to comment
Lockleaf Posted June 19, 2020 Report Share Posted June 19, 2020 I've done both ways. I will pull the engine every time now. If you don't have an engine hoist it can definitely be done through the bottom but my opinion takes hours longer and is way more of a fight than just pulling the motor and trans together. 1 Quote Link to comment
Lockleaf Posted June 19, 2020 Report Share Posted June 19, 2020 On 6/18/2020 at 2:48 PM, banzai510(hainz) said: one really need to jack the front of the truck up to pull both and have a end cap on the trans out put over wise all the oil comes OUT!!!!!!!!!!!!!!!!!!!!!!!!!! I have a drive shaft tone that sheared off a driveshaft for this purpose. It's easy to just shove a yoke in to seal everything 😁 1 Quote Link to comment
matrophy Posted June 20, 2020 Author Report Share Posted June 20, 2020 1 hour ago, Lockleaf said: I've done both ways. I will pull the engine every time now. If you don't have an engine hoist it can definitely be done through the bottom but my opinion takes hours longer and is way more of a fight than just pulling the motor and trans together. Sounds like pulling the engine is the way to go and it's probably safer as well. Last time I did that was probably 40 years ago but hopefully it's like riding a bicycle. I'm going to be taking a look at front bearings in the tranny so I'll be draining it before I pull it anyway. Appreciate the input. 2 Quote Link to comment
powderfinger Posted June 21, 2020 Report Share Posted June 21, 2020 I guess I am in the minority here but I have pulled my 720 transmission out several times and pulling engine seems like way more work to me. One caveat for me is I have a two post lift which makes pulling the tranny way easier. Maybe without the lift I could see pulling the engine to avoid having to be working off your back the whole time. 2 Quote Link to comment
Draker Posted June 21, 2020 Report Share Posted June 21, 2020 If you have a lift, it’s a no brainer. Unless there are welded in cross members in the way the you have no choice. 1 Quote Link to comment
matrophy Posted June 21, 2020 Author Report Share Posted June 21, 2020 3 hours ago, powderfinger said: I guess I am in the minority here but I have pulled my 720 transmission out several times and pulling engine seems like way more work to me. One caveat for me is I have a two post lift which makes pulling the tranny way easier. Maybe without the lift I could see pulling the engine to avoid having to be working off your back the whole time. I'm going to pull both at the same time after taking everything into consideration. I wasn't able to get a good measurement of the overall height of the transmission to do the math to see if I could get enough clearance with 19" jack stands and didn't want to rent a tranny jack to find out that there isn't room. Not to mention that manhandling the tranny from under the truck when it is up so high doesn't seem totally safe. 1 Quote Link to comment
bottomwatcher Posted June 21, 2020 Report Share Posted June 21, 2020 Once you pull it then there is extra work of "while it is out". While it is out may as well change front and rear crankshaft seal, hoses, leaking gaskets ect. Have fun! 2 1 Quote Link to comment
matrophy Posted June 21, 2020 Author Report Share Posted June 21, 2020 2 hours ago, bottomwatcher said: Once you pull it then there is extra work of "while it is out". While it is out may as well change front and rear crankshaft seal, hoses, leaking gaskets ect. Have fun! I planned on doing both tranny seals but hadn't thought about engine seals. Thanks 1 Quote Link to comment
Stoffregen Motorsports Posted June 22, 2020 Report Share Posted June 22, 2020 The rear main engine seal is one that I don't fix if it aint broke. Factory Nissan rear seals last a long time and aftermarket rear main seals are not always the best quality. Unless you are also planning on dropping the pan to seal it up too. Can of worms time... 2 Quote Link to comment
matrophy Posted June 22, 2020 Author Report Share Posted June 22, 2020 9 minutes ago, Stoffregen Motorsports said: The rear main engine seal is one that I don't fix if it aint broke. Factory Nissan rear seals last a long time and aftermarket rear main seals are not always the best quality. Unless you are also planning on dropping the pan to seal it up too. Can of worms time... Thanks. I was reluctantly leaning toward a pre-emptive strike on that seal and now I'm thinking not. 2 Quote Link to comment
Draker Posted June 23, 2020 Report Share Posted June 23, 2020 I usually gauge replacement on how much of a bitch it is to do the job twice. 🙂 2 Quote Link to comment
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