Np205 bracket

[Wildstreak]

Well I've seemed to lost my np205 bracket. I was thinking I could just make one since I have steel and a welder. But I'm not sure how or if I need to incorporate a bushing. Any ideas on what I should do?
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[Redcap]

Originally Posted by Wildstreak

Well I've seemed to lost my np205 bracket. I was thinking I could just make one since I have steel and a welder. But I'm not sure how or if I need to incorporate a bushing. Any ideas on what I should do?
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The bracket bolting the transfer case to the frame? If so...leave it off. They are known for breaking the adapter between transfer case and transmission.

[snj8198]

yep, pitch it. or in your case dont replace it. build a flat bed or something. I got the perfect truck as a canidate!

[Wildstreak]

Redcap Yes thats the one. I guess I'll just leave it hanging and see what happens.
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[Redcap]

Originally Posted by Wildstreak

Redcap Yes thats the one. I guess I'll just leave it hanging and see what happens.
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It'll be fine. If you are really worried about it, you can always get the later strut that runs from the transfer case up to the bellhousing. But even that is unnecessary.

[SunSoaked]

Originally Posted by Redcap

It'll be fine. If you are really worried about it, you can always get the later strut that runs from the transfer case up to the bellhousing. But even that is unnecessary.

Not trying to hijack the thread but is the consensus; bolt the t-case to the trans and nothing more? It just seems weird to me to have almost 200 pounds hanging off the trans tailhousing without any other support.

I ran across a mount that bolts off the 205. I'm guessing it would replace the t-case mount, but it would take the weight off the transmission.

What do ya all think?

[Wildstreak]

I think I see two mounts there. One for the tranny and one for the transfer case in the second pic. I've see something like that before. I have a few wheeler buddies I'll ask them what they think.
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[kenbob87]

i mud bog my 73 K20 and without some kind of support for the tcase it will either break the bellhousing or the tail adaptor i broke two bellhousings and one tail adaptor without any support. built a new support for it and have not had another problem with it for 2 years now... now that being said for everyday use you are probably fine without any support on the tcase but just for piece of mind i would still install one on it... just my 2 cents

[SunSoaked]

Originally Posted by Wildstreak

I think I see two mounts there. One for the tranny and one for the transfer case in the second pic. I've see something like that before. I have a few wheeler buddies I'll ask them what they think.
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Its the same mount off the t-case. Uninstalled and installed points of view.

[Auctioneerhere]

Originally Posted by SunSoaked

Not trying to hijack the thread but is the consensus; bolt the t-case to the trans and nothing more? It just seems weird to me to have almost 200 pounds hanging off the trans tailhousing without any other support.

I ran across a mount that bolts off the 205. I'm guessing it would replace the t-case mount, but it would take the weight off the transmission.

What do ya all think?

Where did you get that? It looks nice to me.

[CrewCab59]

The problem with using those type of mounts it stop the twist and puts all the stress on the trans ,the factory side mount still let the t-case twist with the trans.

[Redcap]

Originally Posted by CrewCab59

The problem with using those type of mounts it stop the twist and puts all the stress on the trans ,the factory side mount still let the t-case twist with the trans.

No it doesn't (unless you are talking about the strut to the bellhousing). That is exactly why it breaks adapters.

[Dale99]

That is a neat design. Mind letting us know where its from?

[puppy]

http://www.trailtechfab.com/gallery/...?g2_itemId=330

Other options
http://www.tmrcustoms.com/store/inde...ort=20a&page=2

[CrewCab59]

Tell me how the solid mount member and the poly builder bushing going to flex on the back of that t-case ?
It's no different than taking a drive shaft and having 1 end fixed so it doesn't rotate and spin the other end , it's going to twist off.

The factory side mount is mounted on rubber and lets the t-case flex a small amount the same time as the engine and trans. The damage is caused by rotten rubber mounts and or loose bolts. If it was such a problem than why after all these years thousands of 4x4 still have them mounted.

You can remove those mounts or mount your T-case solid it's up the owner but to say you better remove it or else is BS.

Just my .02 good luck

[SunSoaked]

I think I agree and disagree with the previous statements. I'm no engineer but I am pretty savy on these types of things.

My opinion is that the trans and t-case would benefit from being supported on the longitudinal axis (front to rear), thus taking the weight of the t-case off the trans tailhousing. Next, I think that there should be one (important) crossmember for both units located between the frame rails. I would locate the rubber (or poly) mounts on the end of the x-member, against the frame.

I think using the mounts in the center, off the trans and t-case like the TTF would work ok. But, factor in leverage from the long axis (center of crank/output shaft, etc) to the frame and it would be more efficient having the mounts farther out on the frame.

My theory is the engine, trans and t-case would act as one assembly (part) in the long axis. The mount would be designed like a "cradle", supporting the weight of both trans/t-case, yet be able to flex under torque as one unit.
Thats my plan. I'm gonna spend some quality time with my tube bender and see what I can come up with. I'll post photos when it's done. It may be a few weeks, I'm waiting for my AA adapter.

???s/thoughts

[puppy]

Originally Posted by CrewCab59

Tell me how the solid mount member and the poly builder bushing going to flex on the back of that t-case ?

It's not. The intention of these parts are for a tranny that is mounted on solid or near solid (poly builder bushing) mounts. Typically in a tube chassis rock crawler and are really only supporting some of the transfer case weight. Keeping a 150-180 lb NP205 from becoming a cantilevered transmission tailshaft wrecking ball.

*Disclaimer to everyone*
Please do not go out and throw one of these on the old 35 year old farm truck that still has the stock engine and tranny mount that are worn out and barely doing their job. You will be replacing the tranny(automatic) or t-case adapter(manual) if you do.

[70K10Hunter]

If I remember correctly, MY truck only had the T/C cross member with the side support, there was no transmission crossmember, but keep in mind my truck also had a TH400 and a SB dont think it came factory with the TH400 just saying. OK just went outside and confirmed there is no transmission mounting holes in my frame. So to say that the T/C is hanging off the end of the trans is I believe incorrect, You have the two motor mounts and a T/C mount to keep everything supported plus you have the side support to add a little more. If you look at it that way the whole assembly would be able to twist a little bit without undo stress on the trans.JMO

[mud slut 350]

support shown above WILL break your trans to tcase adapter from the engine torque. think about it engine twists trans twists if your t case is hard mounted wheres the weak point? the adapter will break ive seen several cases broke from this. your adapter should mount to rubber bushings on a crossmember there is no need for suport. that long bar on stock chevys is pointless. it will be fine "hanging" off the adapter your thinking into it to much the only time you should ever hard mount a t case is if its divorced. a mount like the one above will stop the whole assembly from rotating. most of the stress on the t case is not from "hanging" but the torque that is applied to the bolts between it and the adapter. I wont go anywhere trust me. do what you want but when you start rompin in the woods and break your adapter post pics!

[DBear]

I am trying to figure what is said above.....are you saying the side mount bracket (that connects the np205 to the frame rail) is not necessary??? If that is true, it would help me a great deal with my Cummins swap into my 74 Chevy CC. So, is it necessary? Thanks in advance.

[Redcap]

Originally Posted by DBear

I am trying to figure what is said above.....are you saying the side mount bracket (that connects the np205 to the frame rail) is not necessary??? If that is true, it would help me a great deal with my Cummins swap into my 74 Chevy CC. So, is it necessary? Thanks in advance.

It is absolutely not necessary.

[DBear]

OK...if I just run the stock chevy crossmember, will the energy suspension poly bushings be ok? Or should I get some regular softer type of bushings?

[Burt4x4]

I have been wheeling my K5 sence 1993 with the 205 to frame mount IN place w/Energy Sup. Poly bushings. Zero issues! Even after I droped in a well built 454EFI in place of my 350carbed engine. Zero issues.


AND I do wheel tuff trails....

.025c

Burt

PS ~ I have seen rigs without this mount and owners also have no issues so eaither way I guess...?

[OLDCHEV4X4]

[QUOTE=Burt4x4;5824297]I have been wheeling my K5 sence 1993 with the 205 to frame mount IN place w/Energy Sup. Poly bushings. Zero issues! [QUOTE]

Me too.

[DirtyLarry]

Originally Posted by Burt4x4

I have been wheeling my K5 sence 1993 with the 205 to frame mount IN place w/Energy Sup. Poly bushings. Zero issues! Even after I droped in a well built 454EFI in place of my 350carbed engine. Zero issues.


AND I do wheel tuff trails....

.025c

Burt

PS ~ I have seen rigs without this mount and owners also have no issues so eaither way I guess...?

Originally Posted by OLDCHEV4X4

Me too.

Congratulations with your luck guys. GM stopped tying the tcase to the frame in ’73 for a reason. As I have mentioned in other threads, that reason was related to broken trans to tcase adapters on manual trans trucks and broken bellhousings on automatics due to tcase mount. That was straight from a retired GMC truck engineer that 3 of us members personally know and worked with for several years.

Manual trans rigs have a higher fatality rate of the adapter just due to the greater torque load passing through the driveline and the design of the adapter itself. Automatics didn’t suffer much of adapter (there isn’t much to a TH350/NP205 adapter to begin with) issues but more of cracked transmission bellhousings due being twisted apart by that bracket holding the tcase to the frame.

Think about it, the engine will want to twist with the rotating mass. The engine, trans and tcase all need to rotate together as one assembly. With the tcase to frame bracket in place the powertrain is restricted and something will eventually be twisted beyond its giving point and break. The weakest link is the trans to tcase adapter on 465 rigs and the thin aluminum bellhousings on TH350's in the torque converter area of the bell. The carnage will be worse and happen quicker with worn engine mounts that allow excessive torque rotation. I would imagine a good set of Energy Suspension polyurethane engine mounts would mitigate powertrain movement if one must keep their frame mount.

One thing is for sure, when the day comes when your lucky horseshoe gets lost and you notice a trans fluid leak on the ground then find that nice crack in your adapter or find a broken bellhousing on a 69-72 automatic 4x4, I bet this thread will quickly come to mind and the frame bracket will find its way into the iron pile.